How do u call a function?

I dont know how to call a function! The books just explains but it doesnt show an example. Can someone show me a example or examples?

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Originally Posted by jturner38

I dont know how to call a function! The books just explains but it doesnt show an example. Can someone show me a example or examples?

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printf("Hello, this is a call to function printf");

How would that call a function? I just told u what im tryin to learn to do. How do u call a function? Like say u have a problem. U do a program. After u have return 0; then u have another function after it. Then u want those results in your main function. Well u have to call it in your main function. How do u do that?

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Originally Posted by jturner38

How would that call a function?

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That is an example of a call to the printf function.

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Originally Posted by jturner38

Like say u have a problem. U do a program. After u have return 0; then u have another function after it. Then u want those results in your main function. Well u have to call it in your main function. How do u do that?

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If your function is named f and takes no arguments, then you would write:

Code:

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f();

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If it returns some value that you wish to assign to a variable x, then you would write:

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x = f();

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Also, I am assuming that you mean to say that you defined a function after your main function. If so, you should declare a prototype for your function before the point where you define your main function. If you mean to say that you want to call a function after returning 0 from the main function, then that would be wrong, since your function call would be unreachable.

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Originally Posted by jturner38

I dont know how to call a function! The books just explains but it doesnt show an example. Can someone show me a example or examples?

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Example:

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#include <stdio.h> /* Standard I/O header */


int AddNums( int , int  );
/* Function Declaration, AddNums is called in main, which is before the AddNums function so function is declared here */


int main(void)
{
        int answer1; /* Variable to hold an answer */
        int answer2; /* Same as above */

        answer1 = AddNums( 123, 321 ); /* Call to AddNums, will add 123 and 321 (just random numbers I thought of) and put result in answer1*/

        answer2 = AddNums( 789, 987 ); /* Another call to AddNums, will add 789 and 987 */

        printf("Answer1 = %d\nAnswer2 = %d", answer1, answer2); /* Will print values of answer1 and answer 2 */

        return 0;
}


/* AddNums Function, takes in two numbers, adds them together and returns result*/
int AddNums( int a, int b )
{
        return a + b; /* Return the sum of a and b */
}

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"How do you add two numbers together?"

Asking a series of infinite questions within the same class as that, is no way to learn C. Does your book not explain these things?