Question

求大神帮忙用c语言写一个程序，要求输入一个减法表达式，输出需要借位的次数。如输入2012-456，

Answer 1

#include<stdio.h>
int main()
{
    char expression[22];
    int minuend=0,subtrahend=0,borrow=0;
    int i;
    scanf("%s",expression);
    for(i=0;expression[i]!='-';i++)
        minuend=minuend*10+expression[i]-'0';
    for(++i;expression[i];i++)
        subtrahend=subtrahend*10+expression[i]-'0';
    if(minuend<subtrahend) printf("不合理");
    else
    {
        for(;subtrahend;minuend/=10,subtrahend/=10)
            if(minuend%10<subtrahend%10)
            {
                borrow++;
                subtrahend+=10;
            }
        printf("%d",borrow);
    }
    return 0;
}