求实数绝对值
#include <stdio.h> #include <math.h> double zxd (double x); int main() { double x; while (scanf("%lf", &x)!=EOF) { double y = zxd(x); printf("%.2lf\n",y); } return 0; } double zxd (double x) { double z; if(x>=0) { z=x; } else { z = -x; } return z; }