CODEWITHSUNDEEP
cscanf
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Reputation: 3

Using scanf in a while loop to keep asking the user for a number until a number is entered

So I'm trying to keep asking the user for a number until a number is entered and then print the result but I can't get scanf to be called after the first iteration. Any help would be appreciated.

int main(void) {

    int x;

    int entered_an_number = 0;

    while(!(entered_an_number)) {

        printf("Please enter a number: \n");

        if(scanf("%d", &x) == 1) {
            entered_an_number = 1;
        }
    }

    printf("You entered: %d \n", x);

    return 0;
}

Upvotes: 0

Views: 140

Answers (1)

Carl Norum
Carl Norum

Reputation: 224854

The short answer, like the answer to most scanf questions, is don't use scanf. Use fgets to read a line of input and then scan inside that input, e.g.:

    char input[128];
    fgets(input, sizeof input, stdin);
    if(sscanf(input, "%d", &x) == 1) {
        entered_an_number = 1;
    }

Upvotes: 3

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