int main(){ int s=0,i;for(i=1;i<20;i=i+2){ s+=i;} printf("1-20内的奇数和为%d",s);return 0;}
"奇" : "偶"); printf("%d是%s数\n", c, c & 1 ? "奇" : "偶"); printf("%d是%s数\n",