#include#include //加这个头文件。pow需要用到int round(float x,int n){float z; long i; i=pow(10,n); z=(long)(x*i+0.5)/(float)i; return i;}main(){ float x,y;int n;printf("input x n\n");scanf("%f%d",&x,&n);y=(float)round(x,n);//y是float型。round函数返回的是int 需要强制转换一下printf("x=%f,...
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