A function can be called from anywhere within the program after the function declaration statement. When a function is called, the program control is passed to the function definition block. The statements within the function definition block are executed and the control is handed back.
A function call has the following syntax
functionName([arg_1], [arg_2],...[arg_N]);The function name is followed by any arguments that are passed to the function inside parenthesis. Multiple arguments are separated by comma. The return value of a function can be assigned to a variable in the program.
Example of function call
#include <stdio.h> /* Function Declaration */ int sum(int, int); /* Function Definition */ int sum(int i, int j) { int s; s = i + j; return s; } /* Main Function */ int main() { int a, b, c; printf("Enter two numbers \n"); scanf("%d %d", &a,&b); /* Function Call */ c = sum(a,b); printf("The sum of %d and %d is %d \n", a,b,c); return 0; }
The above program calls the function sum with the input variables a and b as arguments. The sum of these two variables is calculated by the function definition block and the result is returned to the main program.
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