PAT 甲级 A1001 (2019/02/10)

 1 #include<cstdio>
 2 #include<cstdlib>
 3 int main(){
 4     long A,B,C,SUM;    
 5     scanf("%ld%ld",&A,&B);
 6     SUM = A + B;
 7     C = abs(SUM);
 8     if(C < 1000)
 9         printf("%ld",SUM);
10     if(C >= 1000 && C < 1000000)
11         printf("%ld,%03ld",SUM/1000,C%1000);            
12     if(C >= 1000000)
13         printf("%ld,%03ld,%03ld",SUM/1000000,(C/1000)%1000,C%1000);    
14     return 0;
15 }

 

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