Convert Characters into Decimal value of ASCII

ravi119 · #1 15-Feb-2007, 09:23

Hello Everyone

I need to convert Characters into Decimal values of ASCII in C like if I type A i need to have 65 and similarly if I type AA I need to add up them and get 130.
Please help me regarding this.

Thank you for your help in advance.

davekw7x · #2 15-Feb-2007, 10:49

Quote:

Originally Posted by ravi119

Hello Everyone

I need to convert Characters into Decimal values of ASCII in C like if I type A i need to have 65 and similarly if I type AA I need to add up them and get 130.
Please help me regarding this.

Thank you for your help in advance.

Internally they are the same. That is: a char is an integer data type. I/O routines do the conversions for you so that you can see characters rather than their decimal values. Your program does not need to convert anything.

In most systems these days the largest char value is 127, so you will probably want to use ints to hold the value of the arithmetic expressions.

CPP / C++ / C Code:

#include <stdio.h>

int main()
{
    char ca;
    char cb;
    int sum;

    printf("Type in two characters, then press 'Enter': ");
    scanf("%c%c", &ca, &cb);
    sum = ca + cb;

    printf("\nThe characters are:\n");
    printf("  First  character: '%c'\n", ca);
    printf("  Second character: '%c'\n\n", cb);
    printf("Decimal values: \n");
    printf("  First  character = %3d\n", ca);
    printf("  Second character = %3d\n", cb);
    printf("  Sum of the chars = %3d\n", sum);

    return 0;
}

Output:

Code:

Type in two characters, then press 'Enter': Ab

The characters are:
  First  character: 'A'
  Second character: 'b'

Decimal values:
  First  character =  65
  Second character =  98
  Sum of the chars = 163

The arithmetic is done with ints (this is automatic in C) and the value is stored as an int, so the user program doesn't have to "convert" anything.

Regards,

Dave

ravi119 · #3 15-Feb-2007, 14:14

Hi Dave

Thank you for your Reply Dave. But I need arrays of Characters or strings to be converted into its decimals form. Like User may give any input like "a" or "abc" or "abcdef" or "abcAWe" and I need to sum all their decimal values and give output like 97 or 294 or 597.

Thank you.

davekw7x · #4 15-Feb-2007, 17:07

Quote:

Originally Posted by ravi119

Hi Dave

But I need arrays of Characters or strings to be converted into its decimals form.

Just add them up, as I indicated in my example. If you have a string of characters, then make a loop to step through the string and add each character as you go.

CPP / C++ / C Code:

    int i;
    int sum;
    char whatever[BUFSIZ]; /* a large constant */

    /* get something into the array */

    printf("<whatever>: <%s>\n", whatever);
    sum = 0;
    for (i = 0; i < whatever[i] != 0; i++) {
        sum += whatever[i];
    }
    printf("Sum = %d\n", sum);

Output might look something like:

Code:

Enter a string: This is a test
<whatever>: <This is a test>
Sum = 1269

Regards,

Dave

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Convert Characters into Decimal value of ASCII

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