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Character arithmetic in C and C++

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  • Difficulty Level : Easy
  • Last Updated : 30 Jun, 2022
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As already known character range is between -128 to 127 or 0 to 255. This point has to be kept in mind while doing character arithmetic. 

What is Character arithmetic ?

Character arithmetic is used to implement arithmetic operations like addition, subtraction ,multiplication ,division on characters in C and C++ language. 
In character arithmetic character converts into integer value to perform task. For this ASCII value is used.
It is used to perform action the strings.

To understand better let’s take an example.

C




// C program to demonstrate character arithmetic.
#include <stdio.h>
 
int main()
{
    char ch1 = 125, ch2 = 10;
    ch1 = ch1 + ch2;
    printf("%d\n", ch1);
    printf("%c\n", ch1 - ch2 - 4);
    return 0;
}


Output

-121
y

So %d specifier causes an integer value to be printed and %c specifier causes a character value to printed. But care has to taken that while using %c specifier the integer value should not exceed 127. 
So far so good.
But for c++ it plays out a little different.

Look at this example to understand better. 

C++




// A C++ program to demonstrate character
// arithmetic in C++.
#include <bits/stdc++.h>
using namespace std;
 
int main()
{
    char ch = 65;
    cout << ch << endl;
    cout << ch + 0 << endl;
    cout << char(ch + 32) << endl;
    return 0;
}


Output: 

A
65
a

Without a ‘+’ operator character value is printed. But when used along with ‘+’ operator behaved differently. Use of ‘+’ operator implicitly typecasts it to an ‘int’. So to conclude, in character arithmetic, typecasting of char variable to ‘char’ is explicit and to ‘int’ it is implicit. 

let’s take one more example.

C




#include <stdio.h>
// driver code
int main(void)
{
    char value1 = 'a';
    char value2 = 'b';
    char value3 = 'z';
    // perform character arithmetic
    char num1 = value1 + 3;
    char num2 = value2 - 1;
    char num3 = value3 + 2;
    // print value
    printf("numerical value=%d\n", num1);
    printf("numerical value=%d\n", num2);
    printf("numerical value=%d\n", num3);
    return 0;
}


Output:

numerical value=100  
numerical value=97
numerical value=124

This article is contributed by Parveen Kumar. If you like GeeksforGeeks and would like to contribute, you can also write an article using write.geeksforgeeks.org or mail your article to review-team@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.
 


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