循环
勇者愤怒，抽刃向更强者；怯者愤怒，却抽刃向更弱者。 ———鲁迅
- 1.循环打印1-100的数字
int i = 1;// 初始化
while(i < = 100){// 条件表达式
printf("%d\t",i);// 循环体
i++;// 增量
}
- 2.0-250的摄氏度和华氏度的对照表
int i = 0,count = 1;
printf("编号\t摄氏度\t华氏度\n");
while(i < = 250 && count < = 10){
printf("%d\t%d\t%.2lf\n",count,i,i*9/5.0+32);
i + = 20;
count++;
}
- 3.求1-1000的水仙花数
int i = 100;
while(i < = 999){
int g = i/1%10;
int s = i/10%10;
int b = i/100%10;
if(g*g*g+s*s*s+b*b*b == i){
printf("%d\t",i);
}
i++;
}
- 4.打印一个正方形
int i = 1;
while(i < = 10){
int j = 1;
while(j < = i){
printf("* ");
j++;
}
printf("\n");
i++;
}
- 5.判断输入多少字符并选择是否继续
char c,a;
do{
printf("请输入一些字符:\n");
fflush(stdin);
int i = 0;
do{
c = getchar();
i++;
}while(c != '\n');
printf("你输入了%d个字符\n",--i);
printf("是否继续:y/n\n");
a = getchar();
}while(a == 'y' || a == 'Y');
- 6.输入一个数，判断是否合法，如合法将其反转
int i;
do{
printf("请输入一个数:\n");
scanf("%d",&i);
if(i < = 0){
printf("输入的数不合法\n");
}
}while(i < = 0);
// 反转
double sum = 0;
double k = 1.0;
int h = 1;
do{
int g = i/1%10;
k = k/10;
sum += double(g)*k;
h* = 10;
i = i/10;
}while(i != 0);
double d = sum*h;//321.00000
printf("反转后的数是:%d\n",int(d));
- 7.斐波那契数列
int i,j,sum;
i = 2 ; j = 2 ; sum = j;
for(int k = 3;k < = 20;k++){
sum = i+j;
i = j;
j = sum;
printf("第%d个月有%d只\n",k,sum);
}
- 8.打印等腰三角形
int row;
printf("请输入要打印的等腰三角形行数：");
scanf("%d",&row);
for(int i = 0 ; i < row ; i++) {
for(int j = 0;j < row-i-1 ;j++){
printf(" ");
}
for (int K = 0; K < 2*i+1;K++) {
printf("*");
}
printf("\n");
}
- 9.输入日期，判断是一年的第几天
int n,y,r,s;
int e = 28;
printf("请输入日期：(2018-3-15)\t");
scanf("%d-%d-%d",&n,&y,&r);
if(n%4 == 0&& n%100 != 0|| n%400 == 0)
{ e = 29;}
switch(1){
case 1 :
s = r;
if(y == 1){
break;
}
case 2 :
s += 31;
if(y == 2){
break;
}
case 3 :
s += e;
if(y == 3){
break;
}
case 4 :
s += 31;
if(y == 4){
break;
}
case 5 :
s += 30;
if(y == 5){
break;
}
case 6 :
s += 31;
if(y == 6){
break;
}
case 7 :
s += 30;
if(y == 7){
break;
}
case 8 :
s += 31;
if(y == 8){
break;
}
case 9 :
s += 31;
if(y == 9){
break;
}
case 10 :
s += 30;
if(y == 10){
break;
}
case 11 :
s += 31;
if(y == 11){
break;
}
case 12 :
s += 30;
if(y == 12){
break;
}
}
printf("今天是第%d天\n",s);
- 10.输入三个数，比大小
int a,b,c;
printf("请输入三个数：");
scanf("%d%d%d",&a,&b,&c);
if(a > b)
{
if(a > c){
if(b > c){
printf("%d>%d>%d\n",a,b,c);
}else //b < c
{
printf("%d>%d>%d\n",a,c,b);}
}else//a < c
printf("%d>%d>%d\n",c,a,b);
}
else if(a < b)//a < b
{
if(b < c)
{
printf("%d>%d>%d\n",c,b,a);
}
else {
if(a > c){
printf("%d>%d>%d\n",b,a,c);
}else
printf("%d>%d>%d\n",b,c,a);
}
}
