Assertions in C/C++

Here we will see what is assertions in C/C++. The C library macro void assert(int expression) allows diagnostic information to be written to the standard error file. In other words, it can be used to add diagnostics in your C program.

Following is the declaration for assert() Macro.

void assert(int expression);

The parameter of this assert() is expression − This can be a variable or any C expression. If expression evaluates to TRUE, assert() does nothing. If expression evaluates to FALSE, assert() displays an error message on stderr (standard error stream to display error messages and diagnostics) and aborts program execution.

Example Code

#include <assert.h>
#include <stdio.h>
int main () {
   int a;
   char str[50];
   printf("Enter an integer value: ");
   scanf("%d", &a);
   assert(a >= 10);
   printf("Integer entered is %d\n", a);
   printf("Enter string: ");
   scanf("%s", &str);
   assert(str != NULL);
   printf("String entered is: %s\n", str);
   return(0);
}

Output

Enter an integer value: 11
Integer entered is 11
Enter string: tutorialspoint
String entered is: tutorialspoint

Jennifer Nicholas

Published on 03-Apr-2019 10:47:55

• Related Questions & Answers
• Assertions in C#
• Assertions in Java
• Assertions in Python
• Understanding Assertions Cypress
• Lookbehind Assertions JavaScript Regular Expressions
• What are assertions in Selenium with python?
• Assertions in Postman with Chai Assertion Library
• Enable Assertions from the command line in Java
• How to write Assertions in Postman with Chai Assertion Library?
• What are assertions in Python and how are they carried out?
• What are assertions available to test relational comparisons in Selenium with python?
• strcoll() in C/C++
• fseek() in C/C++
• strcpy() in C/C++
• strcmp() in C/C++