Function Prototypes

Created: 2022-08-19
Tags: #fleeting

#include <stdio.h>
#include <math.h>

double sqrt(double);  // This is a function prototype

int main()
    double num = sqrt(2)  // arg converted into double sqrt(2.0) 
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Function Prototypes makes it possible to
-> auto convert any passed arguments to what the data type parameters the function is set For instance sqrt(double) was declared as a function prototype,
the declaration sqrt(2) will have its argument convert into double -> sqrt(2.0)

Note that Function Prototype is not the same as this

int sum(int a, int b)  // This is not a function prototype
 
int main()
    printf("%i", num);

int sum(int a, int b)
    return a + b;
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