C Program to Save output of system command to variable with popen

How to write a C Program to Save output of system command to variable with popen ?

Solution:

C Program System

How to write a C Program System in C Programming Language ?

Solution For C Program :

C Program Concatenating Two Strings Into A Third System

How to write a C Program Concatenating Two Strings Into A Third System in C Programming Language ?

Solution For C Program : 

/*C Program Concatenating Two Strings Into A Third System.*/

#include<stdio.h>

void main()

{

char str1[40], str2[40], str3[81];

int k = 0, j = 0;

printf ("\nEnter The First String : ");

scanf ("%s", str1);

printf ("\nEnter The Second String : ");

scanf ("%s", str2);

for (k = 0; str1[k] != '\0'; k++)

str3[k] = str1[k];

for (j = 0; str2[j] != '\0'; j++, k++)

str3[k] = str2[j];

str3[k] = '\0';

printf ("\nThe Two Stings Are : \n\n%s \t %s\n\n", str1, str2);

printf ("\nThe Concatenated Sting is : %s", str3);

}

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