#include int fun(int n)if(n==1)return 1;else return n+fun(n/10);}int main()printf("%d\r\n",fun(11111));return 0;}#include int main(void){ int sum,i; for(sum=0,i=1;i<=5;(sum*=10)+=i++); printf("the result is %d\n",sum); return 0; }int i,n=0,sum=0; for(i=0;i<5;i++) n=n*10+1; sum=sum+n;}