strupr() function in c

Last Updated : 23 Jun, 2023

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.

Time Complexity: O(n)

Auxiliary Space: O(1)

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.

strupr() function in c

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