这个c程序中的 sign=-sign;是什么意思#include int main(){int sign=-1;double s=0,PI;int i;for (i=1;1.0/i>=1e-7;i=i+2){sign=-sign;s=s+1.0/i*sign;}PI=s*4;printf("i=%d\n",i-2);printf("PI=%10.8f\n\n",PI);return 0;}

这个c程序中的 sign=-sign;是什么意思#include int main(){int sign=-1;double s=0,PI;int i;for (i=1;1.0/i>=1e-7;i=i+2){sign=-sign;s=s+1.0/i*sign;}PI=s*4;printf(i=%d ,i-2);printf(PI=%10.8f ,PI);return 0;} sign=（-1）*sign是什么意思.为什么要再*sign这里,sign是指数值符号. sign sign sign sign sign 程序改错,请问怎么改?#includeint main(void){char sign;int x,y;printf(输入x运算符y:);scanf(%d%c%d,&x,& sign,&y);if(sign='*')printf(%d*%d=%d ,x,y,x*y);else if(sign='/')printf(%d/%d=%d ,x,y,x/y);else if(sign='%')printf(%dMod%d=%d 在C语言中当sign=0; 时 !sign是什么意思啊? sign = ('-'==s[i])?-1:1;这个C语言代码是什么意思呢? sign up ,sign C/C++:#define SIGN(n) (n==0?(n i = i * sign; sum = sum + i ; sign = -sign;和 sum = sum + i * sign ; sign = -sign;有什么区别 PLEASE SIGN IN FIRST.小写是：please sign in first. no sign =not a sign there was ( )of forced entry.A no sign B not sign 选哪个? the sign reads...=the sign said..还是the sign says.. the sign reads...=the sign said还是the sign saysthanks sigh,sight,sign中的g发什么