C语言求圆面积#include "stdio.h"main(){double r,area;printf("input r please(r>0)");scanf("%f\n",&r);area=3.1416rr;printf("r=%6.2f\n",r);printf("area=%d\n",area);}这是改完后的书上写的是main(){float r,area;printf("input r please(r>0)

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C语言 求圆面积#include "stdio.h"main(){double r,area;printf("input r please(r>0)");scanf("%f\n",&r);area=3.1416*r*r;printf("r=%6.2f\n",r);printf("area=%d\n",area);}这是改完后的书上写的是main(){float r,area;printf("input r please(r>0)

C语言求圆面积#include "stdio.h"main(){double r,area;printf("input r please(r>0)");scanf("%f\n",&r);area=3.1416rr;printf("r=%6.2f\n",r);printf("area=%d\n",area);}这是改完后的书上写的是main(){float r,area;printf("input r please(r>0)