exit(), abort(), and assert()

abort()

The function abort() causes the execution to stop unexpectedly. It is suggested that this function not be used for termination. The header file "stdlib.h" declares it.

Syntax

void abort(void);

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Example

#include <stdio.h>
#include <stdlib.h>
int main() {
   int a = 15;
   printf("The value of a: %d\n", a);
   abort();
   printf("Calling of abort()");
   return 0;
}

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Output

The value of a: 15

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In this example, we have used the abort() method to stop the execution unexpectedly.

assert()

The header file "assert.h" declares the assert() method. It evaluates the arguments passed to it. If the expression is correct, it has no effect. If the expression is false, the execution is aborted.

Syntax

void assert(int exp);

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Example

#include <stdio.h>
#include <assert.h>
int main() {
   int a = 15;
   printf("The value of a: %d\n", a);
   assert(a!=15);
   printf("Calling of assert()");
   return 0;
}

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Output

Assertion failed: a!=15, file c.c, line 6
The value of a: 15

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In this example, we have used the assert function to check if the expression is true. The abort function will not work. Otherwise, it will abort and show the error.

Also see, Tribonacci Series and  Short int in C Programming

Frequently Asked Questions

What is the use of exit in C?

The void exit(int status) function in the C library ends the calling process instantly.

What happens when the abort function is called?

The abort function aborts the execution of a currently running process. When the abort function is called, it raises the signal, causing the current process to terminate abnormally.

What is the use of assert in C?

assert is a macro in the C programming language that can be used as a function. It verifies the value of an expression that we would expect to be true under normal conditions.

Conclusion

In this article, we have discussed the exit(), abort(), and assert() functions along with their usage and their syntaxes.

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