1、題目:提示用戶輸入一個正整數n,利用while循環計算並輸出:1-2+3-4+5-6+7…+n的和
#import <Foundation/Foundation.h>
int main(int argc, const char * argv[])
{
//運算的結果
int result = 0;
//用戶輸入的值
int n = 0;
while(n <= 0){
NSLog(@"請輸入一個正整數的值:");
scanf("%d",&n);
}
int current = 0;
while(current < n ){
current ++;
//如果當前值爲偶數,就減
if(current % 2 == 0){
result -= current;
}else{
result += current;
}
}
NSLog(@"計算結果爲%d",result);
return 0;
}
2、題目:提示用戶輸入一個正整數n,計算並輸出n的階乘結果:1*2*3*…*n
#import <Foundation/Foundation.h>
int main(int argc, const char * argv[])
{
//提示用戶輸入的值,用while循環,直到用戶輸入符合要求的數爲止
int n = 0;
while(n <= 0){
NSLog(@"請輸入一個正整數的值:");
scanf("%d",&n);
}
//計算階乘;
int result = 1; // 運算的結果
int current = 1; //當前的乘數
while (current < n) {
result *= current;
current++;
}
NSLog(@"結果爲:%d",result);
return 0;
}
3、 題目:提示用戶輸入一個正整數n,如果n是5,就輸出下列圖形,其他n值以此類推
*
**
***
****
*****
#import <Foundation/Foundation.h>
int main(int argc, const char * argv[])
{
//提示用戶輸入的值,用while循環,直到用戶輸入符合要求的數爲止
int n = 0;
while(n <= 0){
NSLog(@"請輸入一個正整數的值:");
scanf("%d",&n);
}
NSLog(@"-----------------");
for (int i = 0; i <= n; i++) {
for (int col = 1; col <= i; col++) {
printf("*");
}
printf("\n");
}
return 0;
}
4、題目:提示用戶輸入一個小於10的正整數n,如果n是5,就輸出下列圖形,其他n值以此類推
54321
5432
543
54
5
#import <Foundation/Foundation.h>
int main(int argc, const char * argv[])
{
int n = 0;
while (n <= 0 || n >9) {
NSLog(@"請輸入一個一個小於10的正整數");
scanf("%d",&n);
}
NSLog(@"----------");
for (int row = 1 ; row <= n; row++) {
for (int col = n; col >= row; col--) {
printf("%d",col);
}
printf("\n");
}
return 0;
}