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creturnfunction-call

Why do you skip void function calls without catching them?

I want to call a function that calculates the width of a circle.

#include <stdio.h>
void area(double*);
int main()
{
    void* vp = NULL;
    double r;
    printf("input value : ");
    scanf(" %lf", &r);
    (double*)vp = &r;
    void area(vp);
}
void area(double* dp)
{
    double result;
    result = (*dp) * (*dp) * (3.14);
    printf("circle are is : %.2lf", result);
    return 1;
}*

I want to call a function in the //void area (vp)//, but I can not catch the error in visual stdio and proceed as it is. Do you know what the cause is?

Solution

  • To call the function, you write area(vp); not void area(vp);.

    The latter, as it appears in the function main, is a function prototype and has no run-time effect.

    And fix that definition of PI: yours is terribly inadequate given that you use a double type. See Math constant PI value in C