HDU 1002 A+B problemII

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#include<stdio.h>#include<string.h>const int maxn=1000;char f1[maxn],f2[maxn];int f3[maxn];int main(){    int n,l1,l2;    while(scanf("%d",&n)==1){       for(int h=0;h<n;h++){            scanf("%s%s",f1,f2);            int i,j,k,s=0,c=0;            l1=strlen(f1);            l2=strlen(f2);            for(i=l1-1,j=l2-1,k=0;i>=0&&j>=0;i--,j--,k++){                s=f1[i]-48+f2[j]-48+c;                f3[k]=s%10;                c=s/10;            }            if(i>0){                while(i>=0){                    s=f1[i]-48+c;                    f3[k]=s%10;                    c=s/10;                    i--;k++;                }            }            else if(j>0){                while(j>=0){                    s=f2[j]-48+c;                    f3[k]=s%10;                    c=s/10;                    j--;k++;                }            }            if(c){                f3[k]=c;                k+=1;            }            printf("Case %d:\n",h+1);            printf("%s + %s = ",f1,f2);            for(i=k-1;i>=0;i--){                printf("%d",f3[i]);            }            if(h+1<n)                printf("\n\n");            else printf("\n");        }    }    return 0;}
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