Search character in a string

[Zool]

I have written a code that is apparently simple: increase the number of "a" in a phrase written by the user but it is not working. Now I'm looking for the example which replaces a section of the current sstringtring in C program.

[Zecho]

Replaces a section of the current string by some other content determined by the arguments passed. This is a string library that is intended to be compatible with the class string library in the C++ standard. String.Replace Method (Char, Char) Returns a new string in which all occurrences of a specified Unicode character in this instance.

[Walby]

#include <string.h>

char d[] = "tabl+cam";
char *q;

while ((q = strchr(d,'+')) != NULL)
strcpy(q, q+1);

[Aberto]

#include <string>
#include <iostream>
int main() {
  string d = "This is the string which is to be search";
  cout << d << "\n";
  int start = d.find("old");
  int leng = string("old").size();
 d.replace(start, len, "new");
  cout << d << "\n";
  return 0;
}