How do I concatenate two strings in C?

Question

How do I add two strings?

I tried name = \"derp\" + \"herp\";, but I got an error:

Expression must have integral or enum type

Answer 1

#include 
#include 
int main()
{
   int a,l;
   char str[50],str1[50],str3[100];
   printf("\nEnter a string: ");
   scanf("%s",str);
   str3[0]='\0';
   printf("\nEnter the string which you want to concat with string one: ");
   scanf("%s",str1);
   strcat(str3,str);
   strcat(str3,str1);
   printf("\nThe string is %s\n",str3);
}