初识循环语句
#define _CRT_SECURE_NO_WARNINGS
#include
## 初识循环语句--while--for
:::
//for(表达式1-初始化，表达式2-判断，表达式3-调整) // 循环语句；
int main() { for (int i = 0;i <= 10;i++) {//i=0判断进入循环->出来i++执行->i=2判断进入循环.... if (i <= 6) continue;//break printf("%d ", i); } return 0; }
/while(表达式--为真执行\为假结束循环) 循环语;/
int main() { int ch = 0; while ((ch = getchar()) != EOF) { if (ch < '0' || ch>'9') continue; putchar(ch); } return 0; }
int main() { int ch = 0; while ((ch = getchar()) != EOF) //EOF--end of file结束文件标志 {//Ctrl+z结束程序 putchar(ch);//==printf("%c",ch); } return 0; }
int main() { int ch = 0; int ret = 0; char password[20] = { 0 }; printf("enter your PIN:>"); scanf("%s", password); while ((ch = getchar()) != '\n'); { ;//将缓冲区多余的字符和\n读走，确保ret等待输入 } printf("please confirm!(Y/N):"); ret = getchar();//ret=getchar()---scanf("%d",ret) if (ret == 'Y') { printf("land successfully!\n"); } else { printf("land failure!"); } return 0; }
int main()//打印1-10 { int i = 0; while (i <= 9) {//>2语句，需用{} if (i == 6) break;//continue; i++;//break结束循环,continue结束本次循环后面 //的代码，进入下一轮循环 printf("%d ", i); } return 0; }
