16. Understanding the `getenv()` Function

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16. Understanding the `getenv()` Function

What is the `getenv()` function in C, and how does it work? Provide a code example to demonstrate its usage.

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C provides a built-in getenv function that retrieves system variable information in a C program. The return type of this function is a C pointer to the value in the environment. It takes the character value as an argument and returns the results if there is a variable in the environment list, otherwise it prints the NULL value. Here's the code example:-

#include<stdio.h>

#include<unistd.h>

int main()

{

char environment_name[50];

printf("Enter the environment name");

scanf("%s",environment_name);

printf("Environment value:%s\n",getenv(environment_name));

return 0;

}

16. Understanding the `getenv()` Function

16. Understanding the `getenv()` Function

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