Output of C++ programs | Set 29 (Strings)

Prerequisite: Strings

• Question
  What is the Output?

CPP

#include <iostream>
#include <cstring>
using namespace std;

int main()
{
    char s1[] = "geeksforgeeksforgeeks";
    char s2 = 'f';
    char *ptr = strchr( s1, s2);
    cout << ptr;
    return 0;
}

Output: 

forgeeksforgeeks

• Description: strchr( str, c) returns a pointer to the first occurrence of character ‘c’ in str. Here s2 is ‘f’, strchr() returns the address where it occurs for the first time in s1. 
  
• Question
  What is the Output?

CPP

#include <iostream>
#include <cstring>
using namespace std;

int main()
{
    char s1[] = "geeksforgeeksforgeeks";
    char s2[] = "for";
    char *ptr = strstr(s1, s2);
    cout << ptr;
    return 0;
}

Output: 

forgeeksforgeeks

• Description: strstr( str1, str2) returns a pointer to the first occurrence of string str2 in str1. Here s2 is “for”, strstr() returns the address where it occurs for the first time in s1.
  
• Question
  What is the Output?

CPP

#include <iostream>
using namespace std;

int main()
{
    char str[] = "geeksforgeeks";
    cout << 6[str];
    return 0;
}

Output: 

o

• Description: For the compiler 6[str] is same as str[6]. so, it will search for the 6th element in the string “str” and print it which is ‘o’ in this case.
  
• Question
  What is the Output?

CPP

#include <iostream>
#include <cstring>
using namespace std;

int main ()
{
  char string[50] = "geeks, for:geeks";
  char *p;
  p = strtok (string, ", :" ); //, and ; are delimiteres.
  while (p != NULL)
  {
    cout << p << endl;
    p = strtok (NULL, ", :");
  }
  return 0;
}

Output: 

geeks
for
geeks

• Description: strtok() is used to tokenize or phrase the string using delimiters. strtok() returns the string which is before the delimiter and writes NULL immediately after the token in string. 
  
• Question
  What is the Output?

CPP

#include <iostream>
#include <cstring>
using namespace std;

int main ()
{
  char string[50] = "geeksforgeeks";
  memset (string, '*', 8);
  cout << string;
  return 0;
}

Output: 

********geeks

• Description: memset( string, c, n) sets first n characters of string to ‘c’. In this program first ‘8’ characters in the string will be set to ‘*’. We often see this kind of text on the checks, where we want to hide some data. For more details on memset Refer here
  

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