Function that prompts user for integer value and checks for valid input

Question

I currently am stuck on a small part of an assignment I need to do. One requirement of the assignment is

\"Call a function that prompts the user for

Answer 1

What you are looking for is an introduction to functions. Here is one : https://www.tutorialspoint.com/cprogramming/c_functions.htm

This is a very important building block in programming and you should definitely learn to master that concept.

functions will allow you to execute some code in different contexts over and over, just changing the context (the parameters).

It is declared like this

int add(int first, int second){
    //here we can use first and second
    printf("first: %d\n", first);
    printf("second: %d\n", second);

    //and eventually return a value
    return first+second;

}

Now when using we are reusing our previous code to excute a task which result will vary depending of the arguments we pass.

printf("1+2 = %d\n", add(1, 2));
-->3
printf("2+2 = %d\n", add(2, 2));
-->4

Example solution for your task:

//this will handle validation
int validateInput(int input){
    if(isalpha(input)){
        printf("INPUT ERROR!\n");
        return 0;
    }
    return 1;
}

//this will prompt the user and return input only if the input is valid
int askForCoefficient(unsigned char coefficientName){
    int valid = 0;
    int value = 0;
    while(!valid){
        printf("Enter a value for %c: ", coefficientName);
        value = scanf("%d", &value);
        valid = validateInput(value);

    }

    printf("%d\n", value);

    return value;

}