Simple Program Examples

      

Example : Simple C Program Typical Template.

#include<stdio.h>
#include<conio.h>
void main()
{
	clrscr();   // clears the previous contents/output from the screen, if any.
	      
              -----codes------
              -----codes------
              -----codes------

	getch();  // to holds the output on the screen until user press any key button.
}

/* -------------------------------  OR  ------------------------------------*/

#include<stdio.h>
#include<conio.h>
int main()
{
    clrscr();       // clears the previous output contents from the screen, if any.
	 -----codes------
         -----codes------
         -----codes------
   return 0;  
}

Example : Write a program in C to print a message in a different format.

#include<stdio.h>
#include<conio.h>
void main()
{
    clrscr();        
	printf("Welcome U in ur site codershelpline.com");
    getch();  
}

Output :
Welcome U in ur site codershelpline.com

----------  OR  -----------

#include<stdio.h>
#include<conio.h>
int main()
{
    clrscr();        
	printf("Welcome U in ur site codershelpline.com");
    return 0;
}

Output :
Welcome U in ur site codershelpline.com

----------  OR  -----------

#include<stdio.h>
#include<conio.h>
int main()
{
   //clrscr();        
	 printf("Welcome U in ur site \n codershelpline.com");
   return 0;
}

Output :
Welcome U in ur site 
 codershelpline.com

----------  OR  -----------

#include<stdio.h>
#include<conio.h>
int main()
{

   //clrscr();        
	printf("Welcome U in ur site \"codershelpline.com\" ");
     return 0;
}

Output :
Welcome U in ur site "codershelpline.com"

Example : Write a program in C to print a message in another different format.

#include<stdio.h>
#include<conio.h>
int main()
{
   //clrscr();        
	 printf("Welcome");
	 printf("New Year");
	 printf("2021");
   return 0;
}

Output:
WelcomeNew Year2021

------------------------------  OR  ----------------------------

#include<stdio.h>
#include<conio.h>
int main()
{
   //clrscr();        
	 printf("Welcome\n");
	 printf("New Year\n");
	 printf("2021");
   return 0;
}

Output:
Welcome
New Year
2021

------------------------------  OR  ----------------------------

#include<stdio.h>
#include<conio.h>
int main()
{
   //clrscr();        
	 printf("Welcome");
	 printf("\nNew Year\n");
	 printf("2021");
   return 0;
}

Output:
Welcome
New Year
2021

------------------------------  OR  ----------------------------

#include<stdio.h>
#include<conio.h>
int main()
{
   //clrscr();        
	 printf("Welcome");
	 printf("\nNew Year");
	 printf("\n2021");
   return 0;
}

Output:
Welcome
New Year
2021

Example : Write a program in C to display the addition result of two numbers.

#include<stdio.h>
#include<conio.h>
void main()
{
	int a,b,sum;	
	
	a=5;
	b=6;
	
	sum=a+b;
		
	printf("%d",sum);
	getch();
}

Output:
11

-----------------------------  OR  ------------------------------

#include<stdio.h>
#include<conio.h>
void main()
{
	int a,b,sum;	
	
	a=5;
	b=6;
	
	sum=a+b;
		
	printf("%d%d%d",a,b,sum);
	getch();
}

Output:
5611

-----------------------------  OR  ------------------------------

#include<stdio.h>
#include<conio.h>
void main()
{
	int a,b,sum;	
	
	a=5;
	b=6;
	
	sum=a+b;
		
	printf("%d\t%d\t%d",a,b,sum);
	getch();
}

Output:
5       6       11

-----------------------------  OR  ------------------------------

#include<stdio.h>
#include<conio.h>
void main()
{
	int a,b,sum;	
	
	a=5;
	b=6;
	
	sum=a+b;
		
	printf("%d %d %d",a,b,sum);
	getch();
}

Output:
5 6 11

-----------------------------  OR  ------------------------------

#include<stdio.h>
#include<conio.h>
void main()
{
	int a,b,sum;	
	
	a=5;
	b=6;
	
	sum=a+b;
		
	printf("%d,%d,%d",a,b,sum);
	getch();
}

Output:
5,6,11

-----------------------------  OR  ------------------------------

#include<stdio.h>
#include<conio.h>
void main()
{
	int a,b,sum;	
	
	a=5;
	b=6;
	
	sum=a+b;
		
	printf("%d\n%d\n%d",a,b,sum);
	getch();
}

Output:
5
6
11

-----------------------------  OR  ------------------------------

#include<stdio.h>
#include<conio.h>
void main()
{
	int a,b,sum;	
	
	a=5;
	b=6;
	
	sum=a+b;
	printf("The results are = ");	
	printf("%d,%d,%d",a,b,sum);
	getch();
}

Output:
The results are = 5,6,11

-----------------------------  OR  ------------------------------

#include<stdio.h>
#include<conio.h>
void main()
{
	int a,b,sum;	
	
	a=5;
	b=6;
	
	sum=a+b;
	printf("The addition result of %d and %d is = %d",a,b,sum);
	getch();
}

Output:
The addition result of 5 and 6 is = 11

Example : Write a program in C to print an octal value of a decimal number.

#include<stdio.h>
#include<conio.h>
void main()
{
	int a;	
	a=9;
		
	printf("%o",a);
	getch();
}
Output:
11

Example : Write a program in C to print a Hexadecimal value of a decimal number.

#include<stdio.h>
#include<conio.h>
void main()
{
	int a;	
	a=22;
		
	printf("%x",a);
	getch();
}
Output:
16

Example : Write a program in C to print a Scientific notation of a decimal number.

#include<stdio.h>
#include<conio.h>
void main()
{
	int a;	
	a=22;
	printf("%e",a);	
	printf("\n%E",a);

        printf("\n%g",a); (display short form of scientific notation)
	getch();
}

Output:
1.086944e-322
1.086944E-322
1.08694e-322 

Example : Write a program in C to print/display different formats of output.

#include<stdio.h>
#include<conio.h>
void main()
{
	printf("%6d\n",7);
	printf("%3d\n",7);
	printf("%03d\n",7);
	printf("%.2f\n",453.21546);
	printf("%.2f\n",453.21246);
	printf("%.3f\n",453.21546);
	printf("%.5f\n",453.2);
	printf("The hexadecimal value of %d is %x\n", 300,300);
	printf("%04d-%04d-%d\n",05,11,2025);
	printf("The interest amount is %.3f%%\n",25.32);
	printf("I\'ve %d rupees\n",2500);
	printf("\"The total amount is\" %d rupees",2500);
	getch();
}

Output:
     7
  7
007
453.22
453.21
453.215
453.20000
The hexadecimal value of 300 is 12c
0005-0011-2025
The interest amount is 25.320%
I've 2500 rupees
"The total amount is" 2500 rupees

Example : Write a program in C to make a simple calculator.

#include<stdio.h>
#include<conio.h>
void main()
{
	int a,b,add,multi,sub;
	float div;
	
	a=5;
	b=6;
	
	add=a+b;
	multi=a*b;
	sub=a-b;
	div=a/b;
	
	printf("%d%d%d%d%d%f",a,b,add,multi,sub,div);
	getch();
}

Output:
561130-10.000000

/* ----------------------------------  OR  --------------------------------------*/

#include<stdio.h>
#include<conio.h>
void main()
{
	int a,b,add,multi,sub;
	float div;
	
	a=5;
	b=6;
	
	add=a+b;
	multi=a*b;
	sub=a-b;
	div=a/b;
	
	printf("%d\t%d\t%d\t%d\t%d\t%f",a,b,add,multi,sub,div);
	getch();
}

Output:
5       6       11      30      -1      0.000000

/* ----------------------------------  OR  --------------------------------------*/

#include<stdio.h>
#include<conio.h>
void main()
{
	int a,b,add,multi,sub;
	float div;
	
	a=5;
	b=6;
	
	add=a+b;
	multi=a*b;
	sub=a-b;
	div=a/b;
	
	printf("%d %d %d %d %d %f",a,b,add,multi,sub,div);
	getch();
}

Output:
5 6 11 30 -1 0.000000

Example : Write a program in C to calculate the area of a Circle & print them.

#include<stdio.h>
#include<conio.h> 
  void main() 
   { 
     float area,radius; 
     clrscr(); 
     printf("Enter the value for radius: "); 
     scanf("%f",&radius); 
     area=3.14*radius*radius; 
     printf("The Area of Circle is = %f",area);
 
     getch(); 
   }

// NB: Formula of Area of Circle is = 3.14*r*r.    

Example : Write a program in C to calculate the radius of a Circle & Print them.

#include<stdio.h>
#include<conio.h>
#include<math.h>
void main()
{
	int area;
	float r;
	printf("Enter area of circle:-");
	scanf("%d",&area);
	r=sqrt(area/3.14);
	printf("%f",r);
	getch();
}

Example : Write a program in C to calculate the area of a Rectangle & Print them.

#include<stdio.h>
#include<conio.h>
 void main()
   {
    int width,height;
    float area;
    clrscr();

    printf("Enter the value of height: ");
    scanf("%d",&height);
    printf("Enter the value of width: ");
    scanf("%d",&width);   
    area= height*width;
    printf("Area of Rectangle is = %f",area);

    getch();
   }

/*  NB: Formula of Area of Rectangle is = height * width    */

Example : Write a program in C to calculate the area of the Cylinder & Print them.

#include<stdio.h>
#include<conio.h> 
   void main() 
    { 
        int radius,height;
	float area; 
        clrscr();
 
        printf("Enter the value of radius: "); 
        scanf("%d",&radius); 
        printf("Enter the value of height:"); 
        scanf("%d",&height); 
        area= 2*3.14*radius*height; 
        printf("The Area of Cylinder is =  %f",area);
 
        getch(); 
    }

/* NB: Formula of Area of Cylinder is =2*3.14*r*h  */

Example : Write a program in C to calculate the area of the Triangle & print them.

#include<stdio.h> 
#include<conio.h> 
  void main() 
   { 
    int base,height;
    float area; 
    clrscr();
 
    printf("Enter the value of base: "); 
    scanf("%d",&base); 
    printf("Enter the value of height: "); 
    scanf("%d",&height); 
    area= (0.5)*base*height; 
    printf("Area of Trinagle is = %f",area);
 
    getch();
   }
 
/* NB: Formula of Area of Triangle is = 0.5*base*height */

Example : Write a program in C to convert the Celsius value of temperature into Fahrenheit & print them.

#include<stdio.h>
#include<conio.h>

  void main() 
   {
    float fahrenheit,celsius;
    clrscr();

    printf("Enter the value of temperature in celsius: ");
    scanf("%f",&celsius); 
    fahrenheit=1.8*(celsius+32); 
    printf("The temperature in Fahrenheit is =%f",fahrenheit);
 
    getch(); 
   }

/* NB: Formula is fahrenheit = 1.8*(celsius+32);  */ 

Example : Write a program in C to convert the Fahrenheit value of temperature into Celsius & print them.

#include<stdio.h> 
#include<conio.h> 
  void main() 
   { 
    float fahrenheit,celsius; 
    clrscr(); 

    printf("Enter the value of temperature in fahrenheit: "); 
    scanf("%f",&fahrenheit); 
    celsius=0.56*(fahrenheit-32); 
    printf("The value in Celcius is = %f",celsius);
 
    getch(); 
   }

// NB: Formula is celsius=0.56*(fahrenheit-32);

Example : Write a program in C to Swap two values using third variables & print them.

#include<stdio.h> 
#include<conio.h> 
  void main() 
   { 
    int a,b,c; 
    clrscr();
 
    printf("Enter the first Value: "); 
    scanf("%d",&a); 
    printf("Enter the second Value: "); 
    scanf("%d",&b);
    printf("The output before swap is: "); 
    printf("%d\t%d",a,b); 
    c=a; 
    a=b; 
    b=c; 
    printf("\nThe output after swap is: "); 
    printf("%d\t%d",a,b);
 
    getch(); 
   } 

Example : Write a program in c to Swap two values without using third variables & print them.

#include<stdio.h>
#include<conio.h>
void main()
{
    int a,b;
    clrscr();

    printf("Enter the first value :");
    scanf("%d",&a);
    printf("Enter the second value :");
    scanf("%d",&b);
    printf("The result before swapping is :");
    printf("%d\t%d",a,b);
    a=a+b;
    b=a-b;
    a=a-b;
    printf("\nThe output after swapping is :");
    printf("%d\t%d",a,b);

    getch();
}

Example: Write a program in C to calculate the Simple Interest of taken values and display the output.

#include<stdio.h>
#include<conio.h>

void main()
{
	int p,r,t;
	float si;
	
	printf("Enter a Principal Value:\n ");
   	scanf("%d",&p);
   	
   	printf("Enter the Rate:\n ");
   	scanf("%d",&r);
   	
   	printf("Enter time:\n ");
   	scanf("%d",&t);   	

	si=(p*r*t)/100;
	printf("The simple interest is = ");	
	printf("\n%f",si);	
	printf("\n%.2f",si);

	getch();
}

Output:
Enter a Principal Value:
 5000
Enter the Rate:
 3
Enter time:
 4
The simple interest is =
600.000000
600.00

Example : Write a program in C to print the larger values from two values using the conditional/ternary operator.

#include<stdio.h> 
#include<conio.h> 
void main() 
{ 
    int a,b; 
    clrscr(); 
    printf("Enter first value :"); 
    scanf("%d",&a); 
    printf("Enter second value :"); 
    scanf("%d",&b); 
    (a>b) ? printf("Frist value %d is larger",a) : printf("Second value %d is larger",b);
 
    getch(); 
} 

Example : Write a program in C to print the largest value from three values using the conditional/ternary operator.

#include<stdio.h> 
#include<conio.h> 
void main() 
{ 
    int a,b,c; 
    //clrscr(); 
    printf("Enter first value :"); 
    scanf("%d",&a); 
    printf("Enter second value :"); 
    scanf("%d",&b); 
    printf("Enter third value :"); 
   scanf("%d",&c); 
   ((a>b) && (a>c)) ? printf("First value %d is largest",a):((b>c)&&(b>a)) ? printf("Second value %d is largest",b):printf("Third value %d is largest",c); 
    getch(); 
}

Example : Write a program in C to print the year, month, and day value from given total days.

#include<stdio.h> 
#include<conio.h> 
void main() 
{ 
    int day,month,year; 
    clrscr(); 
    printf("Enter the value for total days:"); 
    scanf("%d",&day);
	 
    year=day/365; 
    day=day%365; 
    
    month=day/30; 
    day=day%30;
	 
    printf("\nYear = %d \nMonth = %d \nDay = %d",year,month,day); 
    getch(); 
} 

Example : Write a program in C to print the square root of given values.

#include<stdio.h>
#include<conio.h>
#include<math.h>
void main()
{
   int num; 
   float result;    
   printf("Enter a number: ");
   scanf("%d",&num);	
   result=sqrt(num);
   printf("%f",result);   
   getch();
}

Example : A C program to calculate the compound interest of given values.

#include<stdio.h>
#include<conio.h>
#include<math.h>
void main()
{
	int p,r,t;
	float ci;
	p=1000;
	r=20;
	t=3;
	ci=p*pow((1+r/100),t);
	printf("%f",ci);
	getch();
}

Example : A C program to convert lower case characters to upper case and vice-versa of given values using the C function.

#include<stdio.h>
#include<ctype.h>

int main()
{
   char c1='a';
   char c2='A';
   printf("%c\n",tolower(c1));
   printf("%c",toupper(c2));
   return 0;
}

Example : A C program to show the use of Explicit Typecasting/Type conversion.

int main() 
{
    int num1 = 10;
    float num2=15.35;
		    
    float result=num2+(float)num1;		
    printf("%f",result);		
		
    return 0;
}

Output:
25.350000

----------------  OR  ----------------

#include <stdio.h>

int main() 
{
    int x = 10;
    int y = 3;
    float result;

    result = x / y;
    printf("The result without typcasting is: %f\n", result);

    // Explicit Type casting 'x' and 'y' to float before division
    result = (float)x / (float)y;

    printf("The result after typcasting is: %f\n", result);

    return 0;
}

Output:
The result without typcasting is: 3.000000
The result after typcasting is: 3.333333

Example : A C program to show the use of both Implicit and Explicit Typecasting/Type conversion.

int main() 
{
    float num = 3.14;
    int result = (int)num;	// Explicit Typeconversion	
    printf("%d\n",result);
		
    int result1 = num;		// Implicit Typeconversion
    printf("%d\n",result1);	 	
		
    return 0;
}

Output:
3
3

Example : A C program to show the use of Implicit Typecasting/Type conversion.

int main()

    int num1 = 10;
    float num2=15.35;
		    
    float result=num2+num1;		
    printf("%f\n",result);		
		
    return 0;
}

Output:
25.350000

Example : A C program can be compiled without a main function.

#include<stdio.h>    
#define start main    
void start() 
{    
   printf("Codershelpline.com");    
}    

Example : A C program to print messages without using a semi-colon.

#include<stdio.h>      
void main()
{      
	 if(printf("Codershelpline"))
	 { }  
}