C :

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

int main()
{
    unsigned int a;
    unsigned int b;
    while(scanf("%d%d",&a,&b) != EOF){
        if(a==0 && b==0)break;
        char temp2[20], temp1[20];
        sprintf(temp1,"%d",a);
        sprintf(temp2,"%d",b);
        int ans = 0;
        for(int i = strlen(temp1),j = strlen(temp2);i >= 0&&j >= 0; i--, j--){
            if(temp1[i]-'0' + temp2[j]-'0' >= 10)ans++;
        }
        if(ans==1) printf("%d carry operation.\n",ans);
        if(ans>1) printf("%d carry operations.\n",ans);
        if(ans==0) printf("NO carry operation.\n");
    }

    return 0;
}

C++ :

#include "stdio.h" 
int main() 
{     
	int a,b,c;     
	while(1)     
	{         
		int x = 0;         
		scanf("%d%d",&a,&b);
		if(a == 0 && b == 0) break;
		while(a>0 && b>0)
		{                 
			if(a%10 + b%10 >= 10)                                      
				x++;//只是按位相加，1+999只有1个进位！！--不考虑进位带来新的进位。                                                                  
			a /= 10;                                 
			b /= 10;
		}
		if(x == 0)             
  			printf("NO carry operation.\n");             
     	else 
			if(x == 1)
				printf("1 carry operation.\n");
			else
				printf("%d carry operations.\n",x);
	}
	return 0;
}