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C Beginner 10 min

IF in C

Introductory test to practice basic conditional structures in C.

questions

A short tour through if, if-else and nested if to practice reading flow in C.

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C Beginner 10 min 20 preguntas

IF in C

Introductory test to practice basic conditional structures in C.

Pregunta 1

What is the `if` structure used for in C?

Opcion A To repeat a block of code a fixed number of times Opcion B To make decisions based on a condition Opcion C To declare variables Opcion D To print text on screen

Pregunta 2

What does this program print?

Snippet c

#include <stdio.h>

int main() {
    int age = 20;

    if (age >= 18) {
        printf("Adult");
    }

    return 0;
}

Opcion A Minor Opcion B 18 Opcion C Adult Opcion D Prints nothing

Pregunta 3

What happens if the `if` condition is false and there is no `else`?

Opcion A The program stops Opcion B The if block still runs Opcion C The if block is skipped Opcion D A compile error happens

Pregunta 4

What does this code print?

Snippet c

#include <stdio.h>

int main() {
    int number = 3;

    if (number > 5) {
        printf("A");
    } else {
        printf("B");
    }

    return 0;
}

Opcion A A Opcion B B Opcion C AB Opcion D Prints nothing

Pregunta 5

What is the role of `else` in C?

Opcion A Repeat the condition Opcion B Run a block when the if condition is false Opcion C Close the program Opcion D Declare another variable

Pregunta 6

What does this program print?

Snippet c

#include <stdio.h>

int main() {
    int x = 10;

    if (x == 10) {
        printf("Equal");
    } else {
        printf("Different");
    }

    return 0;
}

Opcion A 10 Opcion B Different Opcion C Equal Opcion D Does not compile

Pregunta 7

Which of the following expressions represents an equality comparison in C?

Opcion A x = 5 Opcion B x == 5 Opcion C x := 5 Opcion D x === 5

Pregunta 8

What does this code print?

Snippet c

#include <stdio.h>

int main() {
    int a = 8;
    int b = 4;

    if (a < b) {
        printf("Smaller");
    } else {
        printf("Greater or equal");
    }

    return 0;
}

Opcion A Smaller Opcion B Greater or equal Opcion C 8 Opcion D 4

Pregunta 9

What is a nested `if`?

Opcion A An if inside another if or inside an else Opcion B An if that runs multiple times Opcion C An if without braces Opcion D An if with a single condition

Pregunta 10

What does this program print?

Snippet c

#include <stdio.h>

int main() {
    int n = 15;

    if (n > 0) {
        if (n % 2 == 0) {
            printf("Positive and even");
        } else {
            printf("Positive and odd");
        }
    }

    return 0;
}

Opcion A Positive and even Opcion B Positive and odd Opcion C Odd Opcion D Prints nothing

Pregunta 11

In a nested `if`, what must happen for the inner if to be evaluated?

Opcion A Nothing, it is always evaluated Opcion B The outer if condition must be met Opcion C There must be an else Opcion D There must be two variables

Pregunta 12

What does this code print?

Snippet c

#include <stdio.h>

int main() {
    int grade = 4;

    if (grade >= 6) {
        printf("Passed");
    } else {
        printf("Failed");
    }

    return 0;
}

Opcion A Passed Opcion B Failed Opcion C 4 Opcion D Prints nothing

Pregunta 13

What does this program print?

Snippet c

#include <stdio.h>

int main() {
    int x = -2;

    if (x > 0) {
        printf("Positive");
    } else {
        if (x == 0) {
            printf("Zero");
        } else {
            printf("Negative");
        }
    }

    return 0;
}

Opcion A Positive Opcion B Zero Opcion C Negative Opcion D Does not compile

Pregunta 14

Which option best describes the use of braces `{}` in an `if`?

Opcion A They are only required if there is a printf Opcion B They delimit the block of instructions Opcion C They are only used with else Opcion D They cannot be used in C

Pregunta 15

What does this code print?

Snippet c

#include <stdio.h>

int main() {
    int age = 17;
    int permission = 1;

    if (age >= 18) {
        if (permission == 1) {
            printf("Can enter");
        } else {
            printf("Cannot enter");
        }
    } else {
        printf("Too young");
    }

    return 0;
}

Opcion A Can enter Opcion B Cannot enter Opcion C Too young Opcion D 1

Pregunta 16

Which operator is used to check if two values are different in C?

Opcion A != Opcion B <> Opcion C !== Opcion D =!

Pregunta 17

What does this program print?

Snippet c

#include <stdio.h>

int main() {
    int x = 0;

    if (x) {
        printf("True");
    } else {
        printf("False");
    }

    return 0;
}

Opcion A True Opcion B False Opcion C 0 Opcion D Does not compile

Pregunta 18

What does this program print?

Snippet c

#include <stdio.h>

int main() {
    int x = 5;

    if (x > 0) {
        printf("A");
    }

    if (x < 10) {
        printf("B");
    }

    return 0;
}

Opcion A A Opcion B B Opcion C AB Opcion D BA

Pregunta 19

What does this code print?

Snippet c

#include <stdio.h>

int main() {
    int number = 12;

    if (number > 0) {
        if (number < 10) {
            printf("Positive, single digit");
        } else {
            printf("Positive, two or more digits");
        }
    } else {
        printf("Not positive");
    }

    return 0;
}

Opcion A Positive, single digit Opcion B Positive, two or more digits Opcion C Not positive Opcion D 12

Pregunta 20

Which of these snippets correctly represents an `if-else` in C?

Opcion A if x > 0 then printf("OK"); else printf("NO"); Opcion B if (x > 0) { printf("OK"); } else { printf("NO"); } Opcion C if x > 0 { printf("OK"); } else { printf("NO"); } Opcion D if [x > 0] printf("OK"); else printf("NO");

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