How to Convert a String to Uppercase in C ?

Converting a String to Upper Case in C

Within the vast realm of programming, string manipulation holds immense importance. Among the myriad string manipulation tasks, the conversion of strings to upper case is a common requirement.

How to Convert a String to Upper Case

In the context of C , the and headers hold the key to string conversion. Consider the following code snippet:

#include <algorithm>
#include <string>

std::string str = "Hello World";
std::transform(str.begin(), str.end(), str.begin(), ::toupper);

Breaking Down the Code

• The header provides access to the std::string class, which represents strings in C .
• The header defines the std::transform algorithm, which applies a transformation to each element in a range.

In this specific instance, the code performs the following steps:

1. Initializes a string str with the value "Hello World."

2. Calls std::transform and specifies three essential arguments:

   • str.begin() and str.end(): The range of elements to be transformed (the entire str)
   • str.begin(): The start of the output range (overwritten with the transformed values)
   • ::toupper: A function pointer that transforms each character to upper case (thanks to the double colons)

The transformation is performed in-place, effectively converting the characters within the str string to upper case.

Output

Assuming successful execution, the str string now holds the value "HELLO WORLD."

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