Question

How to replace one specific digit in a number with other specific digit in C

Answer 1

#include <stdio.h> 
   
int convert_d1_To_d2__(int number, int d1, int d2) { 
    if (number == 0) 
        return 0; 
   
    int digit = number % 10; 
    if (digit == d1) 
        digit = d2; 
   
    return convert_d1_To_d2__(number / 10, d1, d2) * 10 + digit; 
} 
int convert_d1_To_d2(int number, int d1, int d2) { 
    if (number == 0) 
        return d1; 
    else
        return convert_d1_To_d2__(number, d1, d2); 
} 
 
int main() 
{ 
    int number = 18803808; 
     
    printf("%i", convert_d1_To_d2(number, 8, 7)); 
     
    return 0; 
}
 
 
 
/*
run:
 
17703707
 
*/

 

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Answer 2

#include <stdio.h>
 
int replace_digit_in_number(int number, int d1, int d2) { 
    int result = 0, multiply = 1; 
   
    while (number != 0) { 
        int reminder = number % 10; 
        
        if (reminder == d1)  
            result += d2 * multiply;  
        else
            result += reminder * multiply;          
 
        multiply *= 10; 
        number = number / 10; 
    } 
    return result; 
} 
   
int main() 
{ 
    int number = 18803808; 
       
    printf("%i\n", replace_digit_in_number(number, 8, 7)); 
     
    return 0; 
} 
 
 
 
/*
run:
 
17703707
 
*/

 

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