Getting program to repeat over input in C

Question

Hi I'm just starting programming in C and am struggling to write a program designed to take a string of integers and then output if the value being checked is smaller than the one before it. But I cannot get the program to repeat over the data and it seems to only be checking the first value. I have tried using loops but this further confused me. Sorry to ask such a basic question. Here is my code so far:

#include <stdio.h>
#include <stdlib.h>

int
main(int argc, char *argv[]) {

    int num;
    int smaller=0;

    printf("Input integers: ");
    scanf("%d", &num);

    if (num<smaller) {
        printf("*** value %d is smaller than %d \n", num, smaller);
    }
    smaller=num;

    return 0;
}

Hmmm... if you want to repeat something you're probably going to need some kind of loop... have you tried following a basic C tutorial on basic language constructs like for/while loops? — vanza
– vanza, Commented Mar 28, 2014 at 3:21

Carter Sande · Accepted Answer · 2014-03-28 03:38:33Z

4

You could use a do-while loop to ask the user for values over and over again until they type something invalid, like 0:

int smaller=0;
int num=0;
do {
    printf("Input an integer (0 to stop): ");
    scanf("%d", &num);

    if (num<smaller) {
        printf("*** value %d is smaller than %d \n", num, smaller);
    }
    smaller=num;
} while (num != 0);

answered Mar 28, 2014 at 3:38

Carter Sande

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Codemaker2015 · Accepted Answer · 2025-02-23 18:21:03Z

-1

include <stdio.h>
#include <stdlib.h>

int
main(int argc, char *argv[]) {

    int num;
    int smaller=0;

    printf("Input integers: ");
    scanf("%d", &num);

    if (num<smaller) {
        printf("*** value %d is smaller than %d \n", num, smaller);
    }
    smaller=num;

    return 0;
}

edited Feb 23 at 18:21

Codemaker2015

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answered Feb 23 at 17:02

Chandana. V Chandana. V

1

2 Comments

Toby Speight Feb 26 at 13:05

This seems to read only one value, so doesn't answer the question at all.

Jeremy Caney Feb 27 at 0:08

Thank you for contributing to the Stack Overflow community. This may be a correct answer, but it’d be really useful to provide additional explanation of your code so developers can understand your reasoning. This is especially useful for new developers who aren’t as familiar with the syntax or struggling to understand the concepts. Would you kindly edit your answer to include additional details for the benefit of the community?

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