toupper in C Programming

The toupper() function is one of the Standard Library Function available in C language, which is used to convert the given character into Uppercase character. In this article we will show you, How to use toupper in C Programming language with example. Before we get into the example, the basic syntax of the toupper in C language is as shown below.

C toupper Function syntax

Below function will accept the single character as the parameter, and convert the given character to uppercase using the toupper in C.

toupper(char)

toupper in C Programming Example

The toupper method is used to convert the given character to uppercase. This C program allows the user to enter any character, and convert that character to uppercase using the toupper function.

//Example for toupper in C Programming
#include <stdio.h>
#include <ctype.h>

int main()
{
   char ch;
   printf("Please Enter Any Valid Character: \n");
   scanf("%c", &ch);

   printf("\n We Converted Your character to Upper Case = %c", toupper(ch));         

}

OUTPUT

ANALYSIS

First we declared a character variable called ch

char ch;

Following statement will ask the user to enter any character. And then we are using the scanf to assign the user entered character to ch variable

printf("Please Enter Any Valid Character: \n");
scanf("%c", &ch);

Next, we used the toupper() function directly inside the printf statements to print the output. Below statement will convert the character in ch variable to uppercase

printf("\n We Converted Your character to Upper Case = %c", toupper(ch));

Above code will definitely convert the given character to uppercase, but what if, we enter the numeric value

As you can see it is not throwing any error, which might not good in real-time.

toupper in C Programming Example 2

In this example we will show you the better approach to above mentioned C program

//Example for toupper in C Programming
#include <stdio.h>
#include <ctype.h>

int main()
{
    char ch;
    printf("Please Enter Any Valid Character: \n");
    scanf("%c", &ch);

    if(isalpha(ch))
    {
      printf("\n We Converted Your character to Upper Case = %c", toupper(ch));         
    }
    else
    {
      printf("\n Please Enter a Valid character"); 
    }
}

OUTPUT

ANALYSIS

In this code snippet we added the If Statement to check whether the character is between ‘A’ and ‘Z’ using isalpha function. If the condition is True, it will convert the given character to Uppercase using below statement

printf("\n We Converted Your character to Upper Case = %c", toupper(ch));

If the above condition is FALSE then the given character is not Alphabet So, it will print below statement

printf("\n Please Enter a Valid character");

Let me enter the numeric value

TIP: Please refer C Program to Convert Character to Uppercase article to understand, How to convert the character to lowercase without using the toupper function.

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