C Language - C string to uppercase , toupper()

In this section, you will learn how to convert a string value in to uppercase. In the given example, we have define a string in lowercase characters. Therefore, in order to convert the characters of string in uppercase (A to Z), we have used the library function toupper() provided by the header file <ctype.h>.
<ctype.h> - This header file is used for testing and converting characters. 

C String uppercase
Posted on: February 6, 2009 at 12:00 AM

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In this section, you will learn how to convert a string value in to uppercase. In the given example, we have define a string in lowercase characters.

C String uppercase

In this section, you will learn how to convert a string value in to uppercase. In the given example, we have define a string in lowercase characters. Therefore, in order to convert the characters of string in uppercase (A to Z), we have used the library function toupper() provided by the header file <ctype.h>.
<ctype.h> - This header file is used for testing and converting characters. 
Here is the code:
Syntax :
char toupper(char ch);

STRINGUP.C

#include <ctype.h> #include <stdio.h> #include <conio.h> int main(void) {   char st[40]="hello world";   int i;   for (i = 0; st[i]; i++)   st[i] = toupper(st[i]);   printf("The uppercase of String= %s\n", st);   getch();   return 0; }

Output will be displayed as:

STRINGUP.EXE