C语言编写程序都是计算1-3+5-7+……-99+101的值

#include void main() { int a = 0,b = 0,i; for(i = 1;i <= 101;i += 4) a += i; for(i = 3;i <= 99;i += 4) b -= i; printf("%d\n",a+b); }