List of C Programs
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Program #6: To Find Area of Circle

C Language 

#include<stdio.h>
#include<conio.h>
void main() 
{
    float r, a;
    clrscr();
    printf("Enter radius");
    scanf("%f", &r);
    a=3.14 * r * r;
    printf("Area : %f",a);
    getch();
}

/*OUTPUT*/
Enter radius 2.0
Area : 12.560000

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