Question

for example:

istringstream ss("hello hi here haha");
string p;
while (iss >> p)
{
    if (p == "hello")
        statement1;
    else if (p == hi)
        statement2;
}

here parsing is used so what can b used in c for doing this?

Answer 1

Here is an example code that is your snippet translated to C:

#include <stdio.h>
#include <string.h>

int main ()
{
  char s[] ="hello hi here haha";
  char *tok;
  char *last;
  tok = strtok_r(s, " ", &last);
  while (tok != NULL) {
    if(!strcmp(tok, "hello"))
      statement1;
    else if(!strcmp(tok, "hi"))
      statement2;
    tok = strtok_r(NULL, " ", &last);
  }
  return 0;
}

Update I changed the calls of strtok to strtok_r as recommended by Adam Rosenfield in the comments.