How can C language convert letters into numbers?

1 year ago
Benjamin Taylor
1 minute

In C language, letters can be converted into corresponding numbers using ASCII code. ASCII code is a way of encoding characters, with each character corresponding to a unique numeric value.

Here is an example code for converting uppercase letters to numbers:

#include <stdio.h>

int main() {
    char letter = 'A';
    int number = letter - 'A' + 1;
    printf("The corresponding number of %c is %d\n", letter, number);
    
    return 0;
}

In the example above, we assign the letter ‘A’ to the variable letter. Then, by subtracting the ASCII value of ‘A’ from letter and adding 1, we can find the corresponding number. The result is printed using the printf() function.

The same method also applies to lowercase letters, you just need to assign “letter” to a lowercase letter.

#include <stdio.h>

int main() {
    char letter = 'a';
    int number = letter - 'a' + 1;
    printf("The corresponding number of %c is %d\n", letter, number);
    
    return 0;
}

In this way, you can convert letters to numbers. Please note that the above example only considers the conversion of letters, additional processing may be needed for other characters.

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