Question

How to check if the digits before and after the decimal point are equal in C

Answer 1

#include <stdio.h>
 
int is_equal(char *strnum);
  
int main() {
    printf("%d", is_equal("893.893"));  
      
    return 0;
}
  
int is_equal(char *strnum) {
   int left, right;
  
   sscanf(strnum, "%d.%d", &left, &right);
  
   return left == right;
}
  
  
  
/*
run:
  
1
  
*/

 

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Answer 2

#include <stdio.h>
#include <math.h>
#include <string.h>

void removeTrailingZeros(char *str) {
    int len = strlen(str);
    
    while (len > 0 && str[len - 1] == '0') {
        str[len - 1] = '\0';
        len--;
    }
}

int is_equal(double d) {
    int left, right;
    char strnum[32] = "";
    
    sprintf(strnum, "%f", d);
    removeTrailingZeros(strnum);
    
    sscanf(strnum, "%d.%d", &left, &right);

    return left == right;
}
 

int main() {
    double d = 893.893;

    printf("%d", is_equal(d));  
     
    return 0;
}


 
/*
run:
 
1
 
*/
 

 

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