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Functions - Programming

Q1:

There is a error in the below program. Which statement will you add to remove it? 
#include<stdio.h>

int main()
{
    int a;
    a = f(10, 3.14);
    printf("%d\n", a);
    return 0;
}
float f(int aa, float bb)
{
    return ((float)aa + bb);
}

A Add prototype: float f(aa, bb)

B Add prototype: float f(int, float)

C Add prototype: float f(float, int)

D Add prototype: float f(bb, aa)

ANS:B - Add prototype: float f(int, float)

The correct form of function f prototype is float f(int, float);