C语言编程1-2+3-4+5-6+~~+99-100用for,语句～while语句……do-whi

Question

C语言编程1-2+3-4+5-6+~~+99-100用for,语句～while语句……do-while语句

Answer 1

(1)用for:
#include
"stdio.h"
void
main()
{
int
s=0,i=1,j=1;
for(;i<=100;i++)
{
s=s+i*j;
j=-j;
}
printf("1-2+3-4+5-6+~~+99-100=%d",s);
}
(2)用while:
#include
"stdio.h"
void
main()
{
int
s=0,i=1,j=1;
while(i<=100)
{
s=s+i*j;
j=-j;
i++;
}
printf("1-2+3-4+5-6+~~+99-100=%d",s);
}
(3)用do...while:
#include
"stdio.h"
void
main()
{
int
s=0,i=1,j=1;
do
{
s=s+i*j;
j=-j;
i++;
}while(i<=100);
printf("1-2+3-4+5-6+~~+99-100=%d",s);
}
三个程序都运行过。它们的语句基本相同，请仔细看它们的不同之处。