这是什么意思？

Question

#include<stdio.h> #include<math.h> #include<stdlib.h> #define I 20 #define R 340 int main() { int i,j,e,a; for(i=1,a=I;i<I/2;i++,a--) { for(j=(int) ( I-sqrt((double)(I*I-(a-i)*(a-i))) );j>0;j--) printf(" "); for(e=1;e<=2*sqrt((double)(I*I-(a-i)*(a-i)));e++) printf("\3"); for(j=(int) ( 2*( I-sqrt((double)(I*I-(a-i)*(a-i))) ) );j>0;j--) printf(" "); for(e=1;e<=2*sqrt( (double) (I*I-(a-i)*(a-i)) );e++) printf("\3"); printf("\n"); } for(i=1;i<80;i++) { if(i==25) { printf(" I LOVE YOU FY！O(∩_∩)O~ "); i+=30; } printf("\3"); } printf("\n"); for(i=1;i<=R/2;i++) { if(i%2||i%3)continue; for(j=(int) ( R-sqrt( (double) (R*R-i*i) ) );j>0;j--) printf(" "); for(e=1;e<=2*( sqrt( (double)(R*R-i*i) )- (R-2*I) );e++) printf("\3"); printf("\n"); } return 0; }

Answer 1

强制转换，数学函数