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请教一下用C编怎么判断结束? if(EOF==scanf(%d,&pairs)) break; 貌似不行啊 #include<stdio.h> int main() { double xpos[1000],ypos[1000]; int i; int pairs; while(1) { scanf("%d",&pairs); if(EOF==pairs) break; for(i=0;i<pairs;i++) { scanf("%lf",&xpos[i]); scanf("%lf",&ypos[i]); } printf("%d ",pairs); for(i=0;i<pairs-1;i++) printf("%.6f %.6f ",(xpos[i]+xpos[i+1])/2,(ypos[i]+ypos[i+1])/2); printf("%.6f %.6f\n",(xpos[i]+xpos[0])/2,(ypos[i]+ypos[0])/2); } } Followed by:
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