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Program Discussion :: Basics
Home > Programs > Basics

321. Write a program in C using command line argument, take input as diameter of circle and calculate the area of circle.

Answer:

#include <stdio.h>
#include <stdlib.h>
#define PI 3.142

int main(int argc, char * argv[])
{
    float radius, area;
if(argc == 1 ||  argc > 2)
      {
            printf("Enter the diameter of circle\n");
            exit(1);
      }
    radius = atoi(argv[1]) / 2;
    area = PI * radius * radius ;
    printf("Area of a circle = %5.2f\n", area);
}

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