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用QSORT注意点因为qsort返回值为int 类型,所以不能用 return *a-*b!!这样子精度不够! 可以写int cmp(const void* _a,const void* _b) { double *a=(double*)_a; double *b=(double*)_b; if(a[0]-b[0]<0) return -1; else if(a[0]==b[0]) return 0; else return 1; } 不可以写 int cmp(const void* _a,const void* _b) { double *a=(double*)_a; double *b=(double*)_b; return (int )*a-*b; } Followed by:
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