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String Concatenation - STRCAT

/* STRING CONCATENATION - STRCAT */

#include<stdio.h>

int main()
{
 char str1[500], str2[100];
 int i, j;
 printf("Please enter first string: ");
 // gets(str); 
 // fgets is a better option over gets to read multiword string .
 fgets(str1, 500, stdin);
 // Following can be added for extra precaution for '\n' character
 // if(str1[length(str1)-1] == '\n') str1[strlen(str1)-1]=NULL;

 printf("Please enter second string: ");
 // gets(str2); 
 fgets(str2, 100, stdin); 
 // if(str2[length(str2)-1] == '\n') str2[strlen(str2)-1]=NULL;
 
 for(i=0;str1[i]!=NULL;i++);
 for(j=0;str2[j]!=NULL;j++)
 {
  str1[i++]=str2[j];
 }
 str1[i]=NULL;
 
 printf("Concatenated string is: %s",str1);

 return 0;
}

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