Question

How to call to a function using pointer to function in C

Answer 1

#include <stdio.h> 

int (*functionPointer)(const char *s);

int myPuts(const char *s)
{
    puts("This string is from my function:");
    puts(s);
    
    return 1;
}

int main(int argc, char **argv)
{
    functionPointer = puts;
    functionPointer("puts function\n");

    functionPointer = myPuts;
    functionPointer("myPuts function\n");

    return 0;
}


/*
run:

puts function

This string is from my function:
myPuts function

*/

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Answer 2

#include <stdio.h>
 
int (*functionPtr)(int, int);
int sum_function(int a, int b);

int main(void)
{
    functionPtr = sum_function;
    
    int s = (*functionPtr)(7, 3);
    printf("%d", s);
    
    return 0;
}

int sum_function(int a, int b) 
{
    return a + b;
}

/*
run:
 
10

*/

 

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