CODEWITHSUNDEEP
csplitnumbersdivide
Pilfer Ahn
Pilfer Ahn

Reputation: 91

How could I divide a number such as 123 into 1, 2, and 3 in C?

I want to get the decimal digits separately when I get the number. For example, if I get 123 or 321, I want to sort the array or print the digits "1 2 3" or "3 2 1" in C.

Would you please give me some any advice? Use C grammar? 

int nums;
scanf("%d", &nums) // imagin this nums is 123

// and how can I get the number 1,2,3?

In the array. I will sort the number like

for(int i = 0; i<3; i++)
 array[i] = nums;

and I expect in the array number is probably {1,2,3};

Upvotes: 0

Views: 3102

Answers (3)

Johan
Johan

Reputation: 257

Version 2 of SayNum: The “% 10”- method works ok if you’re working with positive integers only. With real numbers (floats), things get a bit tricky, so I used a new method based on “sprintf”- function.

void SayNum (double Num, uint8_t Dp)  // Say Number Ver 2
{
    uint8_t Digit;
    char NumStr[20];

    sprintf (NumStr,"%1.*f",Dp,Num);

    for (int x = 0; x < strlen(NumStr); x++)
    {
        switch (NumStr[x])
        {
            case '-':
                // Say "Minus" (play mp3 audio file) >>
            break;

            case '.':
                // Say "Point" (play mp3 audio file) >>
            break;

            case '0' ... '9':
                Digit = (int)(NumStr[x]) - 48;
                // Say the Digit (play mp3 audio file) >>
            break;
        }
    }
}

With this function you can do positive or negative integers or real numbers. You can also specify how many numbers after the decimal point you want.

Example1 : SayNum(-12,0); // Says the integer -12 (with no decimal places)

Example2 : SayNum(12.34,2); // Says the real number 12.34 (with 2 decimal places)

Upvotes: 0

Johan
Johan

Reputation: 257

I have an application that uses a mp3 player to announce a number. My “SayNum” function takes a (positive) integer like 123 and say it verbally like “One” … “Two” … “Three”. This is the function >> (simplified , left out the detail of commands to the mp3 player to play the tracks):

void SayNum (int Num) // Say- Number- Function
{
    uint8_t Digit;
    int DivNum = 1;
    while ((DivNum * 10) <= Num) DivNum *= 10;
    while (DivNum >= 1)
    {
        Digit = (Num / DivNum) % 10;
        // Say the digit (play mp3 audio file) >>
        DivNum /= 10;
    }
}

You could easily add an index counter in the while loop and then use it to store each digit in an array.

Upvotes: 0

David Ranieri
David Ranieri

Reputation: 41017

You can use a recursive function printing the modulo in each call:

#include <stdio.h>

static void print(int value)
{
    if (value != 0) {
        print(value / 10);
        printf("%d, ", value % 10);
    }
}

int main(void) 
{
    int value;

    scanf("%d", &value);
    print(value);
    return 0; 
}

input: 123

output: 1, 2, 3,

Upvotes: 2

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