How to convert String to Uppercase in C - Step by Step Examples

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How to convert String to Uppercase in C ?

Answer

To convert a string to uppercase in C, you can use the toupper() function from the ctype.h library.

✐ Examples

1 Uppercase of "Hello World" String

In this example,

We declare a character array named str1 with a string value of "Hello World".
We then iterate over each character in str1 and convert it to uppercase using the toupper() function.
Finally, we print the modified str1.

C Program

#include <stdio.h>
#include <ctype.h>

int main() {
    char str1[] = "Hello World";

    for (int i = 0; str1[i] != '\0'; i++) {
        str1[i] = toupper(str1[i]);
    }

    printf("Uppercase of given string is: %s", str1);

    return 0;
}

Output

Uppercase of given string is: HELLO WORLD

2 Uppercase of "apple" String

In this example,

We declare a character array named str2 with a string value of "apple".
We then iterate over each character in str2 and convert it to uppercase using the toupper() function.
Finally, we print the modified str2.

C Program

#include <stdio.h>
#include <ctype.h>

int main() {
    char str2[] = "apple";

    for (int i = 0; str2[i] != '\0'; i++) {
        str2[i] = toupper(str2[i]);
    }

    printf("Uppercase of given string is: %s", str2);

    return 0;
}

Output

Uppercase of given string is: APPLE

Summary

In this tutorial, we learned How to convert String to Uppercase in C language with well detailed examples.

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How to convert String to Uppercase in C - Step by Step Examples

How to convert String to Uppercase in C ?

Answer

✐ Examples

1 Uppercase of "Hello World" String

C Program

Output

2 Uppercase of "apple" String

C Program

Output

Summary

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