c语言正方形的周长和面积(c语言求正方形周长面积)
求正方形边长，面积和周长的C语言程序。
#includestdio.h
main(){
float
i;
printf("请输入正方形一条边的长度");
scanf("%f",i);
printf("正方型的周长为:%4.2f\n",i*4);
printf("正方型的面积为:%4.2f\n",i*i);
}
如何用C语言求矩形的面积和周长
C语言计算矩形的面积和周长，是面试过程中常见的问题之一。其实矩形的面积和周长的计算公式，周长等于2x + 2y，矩形面积=长 x 宽。
周长是围绕二维图形的路径。周长可以用来计算包围一个院子或花园所需的栅栏的长度。对于只有两个边长的矩形，比如x和y，周长等于2x + 2y。矩形面积的公式使用乘法：长 x 宽 = 面积。有四条等边的长方形是正方形。矩形面积单位是平方米、平方厘米等等。
扩展资料：
C语言使用注意事项：
数组是有前后每个值的下标之间是有数学关联的。例如数组a第一个值的下标是i，数组长度为n，最末一个值的下标则是n-1-i。当i递增时，(n-1-i)也随着递减。
函数用数组作为参数，例如func(int a[]);本身就是把数组的地址传入函数中，所以如果修改，会修改原数组的内容。不会从新建立一个数组。
指针的地址必须由多级指针存放。例如int *p,**q,a=12;p=a;q=p。
参考资料来源：百度百科-c语言
参考资料来源：百度百科-矩形
参考资料来源：百度百科-矩形判定定理
用c语言求正方形的面积和周长
#include stidio.h
int fun(int a)
{
int s;
s=a*a;
return s;
}
void main()
{
int a;
printf("输入将要计算的正方形的边长:\n");
scanf("%d",s);
printf("正方形的面积为：%d",fun(a));
}
C语言编8个程序 比如输入正方形边长求其面积和周长 正方体求体积
//?第一个：求数字位数
#include?stdio.h????
#include?stdlib.h????
#include?stdbool.h????
#define?CRT_SECURE_NO_DEPERCATE????
int?main(void)????
{????
int?data;????
printf("Enter?a?number:");????
scanf("%d",data);????
if?(data=10000)????
{printf("Input?Error\n");system("pause");exit;}????
else?if?(data=1000)????
printf("The?number?%4d?has?4?numbers.\n");????
else?if?(data=100)????
printf("The?number?%4d?has?3?numbers.\n");????
else?if?(data=10)????
printf("The?number?%4d?has?2?numbers.\n");????
else?if?(data=1)????
printf("The?number?%4d?has?1?numbers.\n");????
else????{printf("Input?Error\n");system("pause");exit;}????
????
system("pause");????
return?0;????
}
//?第二个24小时制-AM/PM
#include?stdio.h????
#include?stdlib.h????
#include?stdbool.h????
#define?CRT_SECURE_NO_DEPERCATE????
int?main(void)????
{????
int?hour,minute;????
printf("Enter?a?24-hour?time:");????
scanf("%d:%d",hour,minute);????
switch?(hour)????
{????
case?0:case?1:case?2:case?3:case?4:case?5:case?6:case?7:case?8:case?9:case?10:case?11:case?12:????
printf("Equivalent?12-hour?time:?%-2.2d:%-2.2d?AM\n",hour,minute);break;????
case?13:case?14:case?15:case?16:case?17:case?18:case?19:case?20:case?21:case?22:case?23:????
printf("Equivalent?12-hour?time:?%-2.2d:%-2.2d?PM\n",hour-12,minute);break;????
case?24:????
printf("Equivalent?12-hour?time:?00:%-2.2d?AM\n",minute);break;????
default:????
printf("Input?Error\n");system("pause");exit;????
}????
system("pause");????
return?0;????
}
//?第三个比较日期前后
#define?CRT_SECURE_NO_DEPERCATE????
#include?stdio.h????
#include?stdlib.h????
#include?stdbool.h????
int?main(void)????
{????
int?year1,year2,month1,month2,day1,day2,p;????
printf("Enter??first?date?(mm/dd/yy):");????
scanf("%d/%d/%d",month1,day1,year1);????
printf("Enter?second?date?(mm/dd/yy):");????
scanf("%d/%d/%d",month2,day2,year2);????
if?(year1year2)???p=year1year2?1:2;????
else?if?(month1month2)?p=month1month2?1:2;????
else?if?(day1day2)?????p=day1day2?1:2;????
else?????????????????????p=0;????
switch?(p)????
{????
case?1:printf("%2d/%-2.2d/%4d?is?earlier?than?%2d/%-2.2d/%4d\n",month2,day2,year2,month1,day1,year1);break;????
case?2:printf("%2d/%-2.2d/%4d?is?earlier?than?%2d/%-2.2d/%4d\n",month1,day1,year1,month2,day2,year2);break;????
case?0:printf("They?are?definetely?equal.\n");break;????
}????
????
system("pause");????
return?0;????
}
//?第四个给分数评级
#define?_CRT_SECURE_NO_DEPERCATE?/*Before?all?the?includes*/????
#include?stdio.h????
#include?stdlib.h????
#include?stdbool.h????
int?main(void)????
{????
int?grade;????
_Bool?checkpoint;????
checkpoint=true;????
//Input????
while?(checkpoint)????
{????
printf("Enter?numerical?grade:");????
???? scanf("%d",grade);????
if?(grade0||grade100)?{printf("Input?Error,please?try?again\n");system("pause");}????
else?if?checkpoint=false;????
}????
//Output????
printf("Letter?grade:?");????
switch?(grade/10)????
{????
case?10:?case?9:printf("A");break;????
case??8:????????printf("B");break;????
case??7:????????printf("C");break;????
case??6:????????printf("D");break;????
default:????????printf("F");//Don't?wanna?a?break.....????
}????
printf("\n");????
//Pause????
system("pause");????
return?0;????
}
//?第五个用英文显示数字
#define?_CRT_SECURE_NO_DERECATE????
#include?stdio.h????
#include?stdlib.h????
#include?stdbool.h????
int?main(void)????
{????
int?input_number,first_digit,second_digit;????
bool?checkpoint;????
//input????
checkpoint=true;????
while?(checkpoint)????
{????
printf("Enter?a?two-digit?number:?");????
scanf("%d",input_number);????
if?(input_number0||input_number99)?{printf("Input?Error,please?try?again.\n");system("pause");}????
else?checkpoint=false;????
}????
//output????
printf("Your?entered?the?number?");????
if?(input_number=19)????
switch?(input_number)?//0-19????
{????
case??0:printf("zero");?????break;????
case??1:printf("one");??????break;????
case??2:printf("two");??????break;????
case??3:printf("three");????break;????
case??4:printf("four");?????break;????
case??5:printf("five");?????break;????
case??6:printf("six");??????break;????
case??7:printf("seven");????break;????
case??8:printf("eight");????break;????
case??9:printf("nine");?????break;????
case?10:printf("ten");??????break;????
case?11:printf("eleven");???break;????
case?12:printf("twelve");???break;????
case?13:printf("thirteen");?break;????
case?14:printf("forteen");??break;????
case?15:printf("fifteen");??break;????
case?16:printf("sixteen");??break;????
case?17:printf("seventeen");break;????
case?18:printf("eighteen");?break;????
case?19:printf("ninteen");??break;????
}????
else????
{????
first_digit=input_number/10;second_digit=input_number%10;????
switch?(first_digit)????
{????
case?2:printf("twenty");?break;????
case?3:printf("thirty");?break;????
case?4:printf("forty");??break;????
case?5:printf("fifty");??break;????
case?6:printf("sixty");??break;????
case?7:printf("seventy");break;????
case?8:printf("eighty");?break;????
case?9:printf("ninty");??break;????
}????
switch?(second_digit)????
{????
case?0:??????????????;??????break;????
case?1:printf("-one");??????break;????
case?2:printf("-two");??????break;????
case?3:printf("-three");????break;????
??? case?4:printf("-four");?????break;????
case?5:printf("-five");?????break;????
???? case?6:printf("-six");??????break;????
??? case?7:printf("-seven");????break;????
?? case?8:printf("-eight");????break;????
??? case?9:printf("-nine");?????break;????
}????
}????
printf("\n");????
????
//pause????
system("pause");????
return?0;????
}
//?第六个统计最大数字
#define?_CRT_SECURE_NO_DEPRECATE?/*Before?all?the?includes*/????
#include?stdio.h?/*scanf?printf*/????
#include?stdlib.h?/*system*/????
#include?stdbool.h?/*bool?true?false*/????
int?main(void)????
{????
float?input_data,?largest?=?0.0f;????
printf("This?program?is?used?to?caculate?the?largest?number?you?entered.\n");????
do????
{????
printf("Enter?a?number:");????
scanf("%f",?input_data);????
if?(input_datalargest)????
largest?=?input_data;????
}?while?(input_data0);????
if?(largest?==?0)?printf("Input?Error!");????
else?printf("The?largest?number?entered?was?%-5.2f\n",?largest);????
system("pause");????
return?0;????
}
//?第七个计算最大公约数
#define?_CRT_SECURE_NO_DEPRECATE?/*Before?all?the?includes*/????
#include?stdio.h?/*scanf?printf*/????
#include?stdlib.h?/*system*/????
#include?stdbool.h?/*bool?true?false*/???
int?main(void)????
{????
int?a=0,b=0,t;????
bool?checkpoint=false;????
do????
{????
printf("Enter?two?digits:");????
scanf("%d%d?",a,b);????
if?(a=1b=1)?checkpoint=true;?else?printf("Input?error,?please?try?again?with?mind.\n");????
}????
while?(!checkpoint);????
if?(ab)?{t=a;a=b;b=t;}????
while?(b!=0)????
{????
t=a%b;????
a=b;????
b=t;????
}????
printf("GCD(Greatest?common?divisor)?is?%d\n",a);????
????
system("pause");????
return?0;
}
//?第八最简化分数
#define?_CRT_SECURE_NO_DEPRECATE?/*Before?all?the?includes*/????
#include?stdio.h?/*scanf?printf*/????
#include?stdlib.h?/*system?abs*/????
#include?stdbool.h?/*bool?true?false*/
int?main(void)????
{????
int?a=0,b=0,t,point=0,former_a,former_b;????
bool?checkpoint=false;????
do????
{????
printf("Enter?a?fraction:");????
scanf("%d/%d",a,b);????
if?(b!=0)?checkpoint=true;?else?printf("Input?error,?please?try?again?with?mind.\n");????
}????
while?(!checkpoint);????
if?(a==0)?point=1;????
else?switch?((a0)+(b0))????
{????
case?1:point=2;?/*NO?break*/????
default:a=abs(a);b=abs(b);????
}????
printf("In?lowest?terms:?");????
switch?(point)????
{????
case?1:/*a==0*/????
printf("0\n");break;????
case?2:/*negative*/????
printf("-");????
case?0:????
former_a=a;????
former_b=b;????
if?(ab)?{t=a;a=b;b=t;}????
while?(b!=0)????
{????
t=a%b;????
??? a=b;????
b=t;????
??? }????
former_a=former_a/a;????
former_b=former_b/a;????
printf("%d",former_a);????
if?(former_b!=1)?printf("/%d",former_b);????
printf("\n");????
break;/*useless*/????
}????
system("pause");????
return?0;????
}
C语言编写程序,输入一个正方形的边长，输出其周长和面积
#include stdio.h
int main()
{
int l = 0;
print("请输入边长:\n");
scanf("%d", l);
int s = l * l;
int c = 4 *l;
printf("面积:%d 周长:%d\n", s, c);
return 0;
}
编写程序球正方形，长方形，梯形，圆形的周长和面积？ 我是学习C语言的新手 麻烦高手给出源代码
不知道输入，输出格式是什么，就随便写了。
#includestdio.h
int main()
{
int choice=0;
float a,b,c;
while(true)
{
printf("1.正方形\n2.长方形\n3.梯形\n4.圆\n0.退出\n请选择:");
scanf("%d",choice);
switch(choice)
{
case 1:
printf("输入正方形的边长：");
scanf("%f",a);
while(a=0)
{
printf("错误！重新输入：");
scanf("%f",a);
}
printf("面积 = %.2f\n",a*a);
break;
case 2:
printf("输入长方形的长、宽：");
scanf("%f%f",a,b);
while(a=0||b=0)
{
printf("错误！重新输入：");
scanf("%f%f",a,b);
}
printf("面积 = %.2f\n",a*b);
break;
case 3:
printf("输入梯形的上底、下底、高：");
scanf("%f%f%f",a,b,c);
while(a=0||b=0||c=0)
{
printf("错误！重新输入：");
scanf("%f%f%f",a,b,c);
}
printf("面积 = %.2f",(a+b)*c/2);
break;
case 4:
printf("输入圆的半径：");
scanf("%f",a);
while(a=0)
{
printf("错误！重新输入：");
scanf("%f",a);
}
printf("面积",3.14*a*a);
break;
case 0:
return 0;
}
}
return 0;
}