Error Check for scanf using while loops?

**KingGypsy** · 04-17-2016

I've been trying to do an error check for my program, for scanf using a while loop, but I am unsure of how to do this.
I want to make sure the user inputs between 4 and 8 for number of judges, and the score doesn't go below 0 or above 10.
could someone please help me out?
Thanks!

Code:



#include<stdio.h>

int i,j,k, judges;
float max, min,total;

int main(){
   max =0.0;
   min =10.0;
   judges =0;
   total =0;

printf("Enter number of judges between 4-8: ");
scanf("%d",&judges);

    float scores[judges];

for(i =0; i < judges; i++){
    printf("Enter a score for judge %d : ", i +1);
    scanf("%5f",&scores[i]);
}
for(j =0; j < judges; j++){
    if(min > scores[j]){
        min = scores[j];
    }
    if(max < scores[j]){
        max = scores[j];
    }
}
for(k =0; k < judges; k++){
    total = total + scores[k];
}
total = total-max-min;
printf("max = %4.1f    min = %4.1f    total = total = %4.1f", min,   max,total);
}

**GReaper** · 04-17-2016

You simply keep calling scanf until the user inputs the numbers you want. Here, a do-while loop would be more intuitive, like this:

Code:

do {
    // Check in case user gives a letter or something
    if (scanf("%d", &input) != 1) {
        getchar(); // Discard that extra character
    }
} while (low <= input && input <= high);

or even better, you can make that code into a function for maximum re-usability.

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