Question

编写程序，输入一个正整数，计算并显示该整数的各位数字之和，例如123各位数之和是1+2+3，等于6

Answer 1

#include <stdio.h>
void main(){
int n,m=0,s=0;
scanf("%d",&n);
while(n)
{m=m*10+n%10;n/=10;}
while(m){
printf("%d+",m%10);
s+=m%10;
m/=10;
}
printf("\b=%d",s);
}

//运行示例：

Answer 2

var a,ans:int64;
begin
readln(a);
repeat
ans:=ans+a mod 10;
a:=a div 10;
until a=0;
writeln(ans);
end.

Answer 3

关键
{sum=sum+num%10
num =num/10
}while(num)