C program to String Concatenation - STRCAT

Below is C program to String Concatenation - STRCAT.

Program:

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/* 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; }