Check if a string has only numbers in C?

Question

I\'m trying to write a simple code to check if a string only has numbers in it. So far it\'s not working, any help would be appreciated.

#include          


        

Answer 1

#include 
#include 

int main()
{
    char numbers[10];
    int i, correctNum = 0;

    scanf("%s", numbers);

    for(i = 0 ; i < 10 ; i++)
    {
        if(numbers[i]<48||numbers[i]>57)
        {
            correctNum = 1;
            break;
        }
    }

    if(correctNum == 1)
    {
        printf("That number has a char in it. FIX IT.\n");
    }
    else
    {
        printf("All numbers. Good.\n");
    }
    return 0;
}