How to get ASCII value in C

For text data on computers and the internet, ASCII (American Standard Code for Information Interchange). It is the most widely used character encoding standard. One hundred twenty-eight alphabetic, numeric, special extra characters and control codes have unique values in typical ASCII-encoded data. Character encoding for telegraph data is the basis for ASCII encoding. It was initially released in 1963 as a computing standard by the American National Standards Institute.

The upper and lowercase letters A through Z, the digits 0 through 9, and the most common punctuation marks are all included in the ASCII encoding. It also makes use of a few control characters that aren't used for printing but were developed for teletype printing terminals.

A character variable in the C programming language instead stores the variable's ascii value instead of a character value. Each character variable is given a number between 0 and 127 as its ascii value, which represents the character variable in numbers. A's ascii value, for instance, is 65.

The following are possible representations for ASCII characters:

• Base-16 numbers rendered as pairs of hexadecimal digits, with the decimal values of 10-15 represented by 0 through 9 and A through F
• As octal (base 8) numerals with three digits
• As decimal numbers from 0 to 127
• As either 7- or 8-bit binary

Getting ASCII values

Here, characters that include both upper- and lowercase letters from the alphabet and strings and character variables are included in the ASCII values.

For example, the ASCII value of ‘A’ is 65.

This implies that 65 is saved in the character variable instead of the letter "A" if you assign the letter "A" to it.

Let us now look at how to print a character ASCII value in C programming.

Program to print the ASCII value

#include <stdio.h>
int main() {  
    char c;
    printf("Enter desired character: ");
    scanf("%c", &c);  
    // %d shows a character's integer value.
    // %c shows the actual character.
    printf("ASCII value of %c = %d", c, c);
    return 0;
}

Output

The output seen above demonstrates that the user entered the character "S" and that, as a result, the character's ascii value, 83, was produced.

A character must be entered by the user in this programme. Variable c contains a copy of the character.

The ASCII value of the letter S, 83, is displayed when the format string %d is used.

G is shown when the format string %c is used.

Now similarly it is possible to find out the character corresponding to the ASCII value

Let us look at the example programme for the above-mentioned event.

#include <stdio.h>
#include<conio.h>
int main()
{
    int k;
    printf("Enter the number within the range 0 to 127: ");
    scanf("%d", &k);
    char c = k; // automatically converted to a character from an integer
    printf("Character that is corresponding to the ASCII value %d = %c\n", k, c);
    return 0;
}

Output

There is also a possibility where printing of all the ASCII values takes place.

Now let us demonstrate a C program to the ASCII values of all the characters.

#include <stdio.h>  
#include<conio.h>
int main()  
{  
 int s;   // variable declaration   section
 for(int s=0;s<=255;s++)  // it is afor loop from 0-255  
 {  
     printf("\nThe ascii value of %c is %d", s,s);  
 }  
return 0;  
}

Try on the above code to see the output for better understanding.

The application mentioned above will show the ascii value for each character. Since we are aware that all characters have an ascii value that ranges from 0 to 255, we iterate the for loop from 0 to 255.

We will now write a programme that adds the ascii values in a string.

#include <stdio.h>  
#include<conio.h>
int main()  
{  
    int sum=0;  // initializing the variable
    char name[50];  // initializing the variable
    int k=0;  // initializing the variable
    printf("Enter your desired name: ");  
    scanf("%s", name);  
    while(name[k]!='\0')  // using the while loop 
    {  
        printf("\nThe ascii value of the character %c is %d", name[k],name[k]);  
        sum=sum+name[k];  
        k++;  
    }  
    printf("\nSum of the ascii value of the considered string is : %d", sum);  
    return 0;  
}  

Output:

In the code above, we are accepting user input in the form of a string. After receiving user input, we run a while loop that adds the ascii values of each character in a string and stores the result in a variable called ‘sum’.