Goto statement overview in C - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of a simple goto jump

What is the output of this C program?

C

#include <stdio.h>

int main() {
    int x = 0;
    goto skip;
    x = 5;
skip:
    printf("%d", x);
    return 0;
}

A 0

B 5

C Compilation error

D Undefined behavior

💡 Hint

The goto skips the assignment to x.

The goto jumps over the line 'x = 5;', so x remains 0. The program prints 0.

❓ Predict Output

intermediate

Effect of goto inside a loop

What is the output of this C code?

C

#include <stdio.h>

int main() {
    int i = 0;
start:
    if (i >= 3) goto end;
    printf("%d ", i);
    i++;
    goto start;
end:
    return 0;
}

A 0 1 2

B Infinite loop

C 0 1 2 3

D Compilation error

💡 Hint

The goto creates a loop until i reaches 3.

The code prints 0, 1, 2 with spaces, then exits when i is 3.

🔧 Debug

advanced

Identify the error caused by goto

What error does this C code produce when compiled or run?

C

#include <stdio.h>

int main() {
    int x = 10;
    goto label;
    x = x + 5;
label:
    printf("%d", x);
    goto label;
    return 0;
}

A No error, prints 10 once

B Compilation error: label redefined

C Runtime error: segmentation fault

D Infinite loop at runtime

💡 Hint

The goto jumps back to the same label without exit.

The code jumps to 'label' and then jumps back to 'label' again, causing an infinite loop printing 10 repeatedly.

📝 Syntax

advanced

Which option causes a syntax error?

Which of these goto usages causes a syntax error in C?

A goto start;

B goto 123label;

C end_label: printf("Hi");

D goto end_label;

💡 Hint

Labels must start with a letter or underscore.

Label names cannot start with a digit. '123label' is invalid syntax.

🚀 Application

expert

How many times is the word printed?

How many times will the word "Hello" be printed by this C program?

C

#include <stdio.h>

int main() {
    int count = 0;
start:
    if (count == 3) goto end;
    printf("Hello\n");
    count++;
    goto start;
end:
    return 0;
}

A Infinite times

B 4

C 3

D 0

💡 Hint

The loop stops when count reaches 3.

The program prints "Hello" three times before jumping to end and stopping.