Discussion
What will be the output of the program (Turbo C in 16 bit platform DOS) ?
#include <stdio.h>
#include <string.h>
int main()
{
char *str1 = "India";
char *str2 = "BIX";
char *str3;
str3 = strcat(str1, str2);
printf("%s %s\n", str3, str1);
return 0;
}
Answer: B
Correct answer: IndiaBIX IndiaBIX
strcat appends to its first argument and returns that same pointer, so str3 and str1 end up pointing at the same characters - and both print IndiaBIX. Note that str1 points to a string literal with no room after it, so appending to it is undefined behaviour; the old DOS compiler this question assumes allowed it, but a modern one will usually crash.
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