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四舍五入
http://www.nowcoder.com/questionTerminal/c47aa387f2c34e4dae48c97f0974646c
#include <stdio.h>
int main(){
int a,b;
scanf("%d",&a);
if(a%10>=5){
b=a+(10-(a%10));
}else{
b=a-a%10;
}
printf("%d",b);
}
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