CODEWITHSUNDEEP
cloopsfor-loopascii
dave
dave

Reputation: 71

converting ascii to an interger (C)

I'm brand new to C and i'm working on a method that converts an ascii to an integer. So bascially if i have ABCD (base 16) ill get 43981 (base 10).. Just a short walk through of what i have. I take one digit at i time from the string then that number needs to be translated so i call my chartoint method. Then i think i need to * the pervious result by the base before i add the new number. I am also confused on the printf method. Here is my method so far. 

void ascii2int(char *ascii, int base){
    int totalstring = 0;    
    if(2<= base && base <= 16){ 
        for (int i = 0; i < strlen(ascii); i++) {
            // Extract a character
            char c = ascii[i];
            // Run the character through char2int
            int digit = char2int(c);
            totalstring= digit * base;
            printf("%d/n",totalstring);
        }
    }
}

char2int

 int char2int(char digit){
    int converted = 0;   
    if(digit >= '0' && digit <= '9'){
    converted = digit - '0';
    }   
    else if( digit >= 'A' && digit <= 'F'){
    converted = digit - 'A' + 10;       
    }
    else{
    converted = -1;}
return converted;
}

Upvotes: 0

Views: 964

Answers (2)

dave
dave

Reputation: 71

Solution :

void ascii2int(char *ascii, int base){
//int digit = 0;    
int totalstring = 0;    
if(2<= base && base <= 16){ 
for (int i = 0; i < strlen(ascii); i++) {
    // Extract a character
    char c = ascii[i];
    // Run the character through char2int
    int digit = char2int(c);
totalstring = totalstring * base + digit;
        }
printf("%d", totalstring);

}

}

Upvotes: 0

barak manos
barak manos

Reputation: 30136

Assuming that function char2int is implemented correctly...

Change this:

totalstring = digit * base;

To this:

totalstring *= base;  // totalstring = totalstring * base
totalstring += digit; // totalstring = totalstring + digit

Or to this:

totalstring = totalstring * base + digit;

In addition, call printf outside the for loop (and change that /n to \n).

Upvotes: 3

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