How can I check if a number is descending, and have a flag that would indicate yes or no? Not an array.

In the last loop, last or x take value 0, and because of that answer is not correct.

while(n>1)
    {
        last=n;
        x=n/10;
        
        if(last>x){
            flag=0;
        }
        if(last<x){
            flag=1;
        }
        n=n/10;
    }
    if(flag==0) printf("0\n");
    else printf("1\n");

CodePudding user response：

#include <stdio.h>
#include <stdbool.h>

bool isDescending(int n)
{
    bool descending=true;
    
    while(n/10 && descending)
    {
        int d=n;
        n/=10;
        descending = d<n;
    }
    return descending;
}

int main(void) {
    int test[] = { 123456, 975310 };
    for(int i=0; i<2;   i)
    {
        printf("Descending %d: %s\n", test[i], isDescending(test[i])? "Yes" : "No" );
    }
    
    
    return 0;
}

Result:

Success #stdin #stdout 0s 5432KB
Descending 123456: No
Descending 975310: Yes