Question

用C++写一条for语句,计数条件为n从100到200,步长为2,然后再用while和do-while语句完成同样的循环.

Answer 1

#include<iostream>
using namespace std;
int main()
{
for(int i=100;i<=200;i=i+2)
{
cout<<i<<endl;
}
int i=100;
while(i<=200)
{
cout<<i<<endl;
i=i+2;
}
i=100;
do{
cout<<i<<endl;
i=i+2;
}while(i<=200);
return 0;
}

Answer 2

for(n=100;n<=200;n=n+2)

N=100;
while(N<=200){
N=N+2;
}

M=100
do
{
M=M+2;
}
while(M<=200);

Answer 3

int sum = 0;
for(int n = 100; n <= 200; n += 2) sum += n;

sum = 0;
n = 100;

while(n <= 200)
{
sum += n;
n += 2;
}

sum = 0;
n = 100;
do{
sum += n;
n += 2;
}while(n <= 200);

Answer 4

#include <iostream>
using namespace std;
int main() {
int n = 100;
for (;n <= 200;n = n + 2)

cout << n << " ";

return 0;
}