C program to find the ASCII value of a character

In this post, you will learn how to find the ASCII value of a character in the C programming language.

ASCII stands for American Standard Code for Information Interchange. It is a character encoding that uses numeric codes to represent characters. Each letter is assigned a number between 0 and 127. An upper and lower case character are allocated different numbers. For example, the character 'A' is assigned the decimal number 65, while 'a' is assigned decimal 97.

When a PC sends information, the keys you press or the content you send and receive is sent as a bunch of numbers. These numbers represent the characters you typed or produced. Since the scope of standard ASCII is 0 to 127, it just requires 7 bits or 1 byte of data.

C Program to display the ASCII value of a character entered by the user -

The given program takes the character entered by the user and displays the ASCII value of it. When we use %d format specifier for a char variable, then it displays the ASCII value of a char.

#include <stdio.h>
int main()
{
    char chr;
    printf("Enter any character: ");

    scanf("%c", &chr);

    printf("ASCII value of character %c is: %d", chr, chr);
    return 0;
}

Output 1

Enter any character: F
ASCII value of character F is: 70

Output 2

Enter any character: O
ASCII value of character O is: 79

C program to find ASCII values of all characters -

If you want to know the ASCII values of all characters between the range 0 to 50. We can iterate over this range using a for loop and know their ASCII values -

#include <stdio.h>

int main()
{
  int i;

  for(i=0;i<=50;i++)
   {
    printf("The ASCII value of %c = %d\n",i,i);
   }
  return 0;
}

Output of the above code - ASCII Values

C Program to display the ASCII value of a string entered by the user -

In the given example, we have asked the user to enter a string and used the while loop to find the ascii value of characters of the string.

#include <stdio.h>  
int main()  
{  
    // variable initialization 
    char name[20];   
    int i=0;  
    printf("Please enter a name: ");  
    scanf("%s", name);  
    while(name[i]!='\0')  // while loop  
    {  
        printf("\nThe ascii value of the character %c is %d", name[i],name[i]);  
        i++;  
    }  
    return 0;  
}

Output of the above code:

Please enter a name: Priska
The ascii value of the character P is 80
The ascii value of the character r is 114
The ascii value of the character i is 105
The ascii value of the character s is 115
The ascii value of the character k is 107
The ascii value of the character a is 97

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