strupr() function in c - GeeksforGeeks

The strupr( ) function is used to converts a given string to uppercase.

Syntax:

char *strupr(char *str);

Parameter:

str: This represents the given string which we want to convert into uppercase.

Returns: It returns the modified string obtained after converting the characters of the given string str to uppercase.

Below programs illustrate the strupr() function in C:

Example 1:-

// c program to demonstrate 
// example of strupr() function. 
#include<stdio.h> 
#include<string.h> 
  
int main() 
{ 
    char str[ ] = "geeksforgeeks is the best"; 
    //converting the given string into uppercase. 
    printf("%s\n", strupr (str)); 
    return  0; 
} 

Output:

GEEKSFORGEEKS IS THE BEST

Example 2:-

// c program to demonstrate 
// example of strupr() function. 
  
#include<stdio.h> 
#include <string.h> 
  
int main() 
{ 
  char str[] = "CompuTer ScienCe PoRTAl fOr geeKS"; 
  
  printf("Given string is: %s\n", str); 
  
  printf("\nstring after converting to the uppercase is: %s", strupr(str)); 
  return 0; 
} 

Output:

Given string is: CompuTer ScienCe PoRTAl fOr geeKS

string after converting to the uppercase is: COMPUTER SCIENCE PORTAL FOR GEEKS

Note : This is a non-standard function that works only with older versions of Microsoft C.

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