5个经典的C语⾔基础算法及代码
1、计算Fibonacci数列
Fibonacci数列⼜称斐波那契数列，⼜称黄⾦分割数列，指的是这样⼀个数列：1、1、2、3、5、8、13、21。 C语⾔实现的代码如下：
#include <stdio.h>
int main()
{
int count, n, t1=0, t2=1, display=0;
printf("Enter number of terms: ");
scanf("%d",&n);
printf("Fibonacci Series: %d+%d+", t1, t2); /* Displaying first two terms */
count=2; /* count=2 because first two terms are already displayed. */
while (count<n)
{
display=t1+t2;
t1=t2;
t2=display;
++count;
printf("%d+",display);
}
return 0;
}
结果输出：
Enter number of terms: 10
Fibonacci Series: 0+1+1+2+3+5+8+13+21+34+...
2、回⽂检查
源代码：
#include <stdio.h>
int main()
{
int n, reverse=0, rem,temp;
printf("Enter an integer: ");
scanf("%d", &n);
temp=n;
while(temp!=0)
{
rem=temp%10;
reverse=reverse*10+rem;
temp/=10;
}
/* Checking if number entered by user and it's reverse number is equal. */
if(reverse==n)
printf("%d is a palindrome.",n);
else
printf("%d is not a palindrome.",n);
return 0;
}
结果输出：
Enter an integer: 12321
12321 is a palindrome.
3、质数检查
注：1既不是质数也不是合数。
源代码：
/* C program to check whether a number is prime or not. */
#include <stdio.h>
int main()
{
int n, i, flag=0;
printf("Enter a positive integer: ");
scanf("%d",&n);
for(i=2;i<=n/2;++i)
{
if(n%i==0)
{
flag=1;
break;
}
}
if (flag==0)
printf("%d is a prime number.",n);
else
printf("%d is not a prime number.",n);
return 0;
}
结果输出：
Enter a positive integer: 29
29 is a prime number.
4、打印⾦字塔和三⾓形
使⽤ * 建⽴三⾓形
*
* *
* * *
* * * *
* * * * *
源代码：
#include <stdio.h>
int main()
{
int i,j,rows;
printf("Enter the number of rows: "); scanf("%d",&rows);
for(i=1;i<=rows;++i)
{
for(j=1;j<=i;++j)
{
printf("* ");
}
printf("\n");
}
return 0;
}
如下图所⽰使⽤数字打印半⾦字塔。
1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
源代码：
#include <stdio.h>
int main()
{
int i,j,rows;
printf("Enter the number of rows: "); scanf("%d",&rows);
for(i=1;i<=rows;++i)
{
for(j=1;j<=i;++j)
{
printf("%d ",j);
}
printf("\n");
}
return 0;
}
⽤ * 打印半⾦字塔
* * * * *
* * * *
* * *
* *
*
源代码：
#include <stdio.h>
int main()
基础c语言代码
{
int i,j,rows;
printf("Enter the number of rows: ");
for(i=rows;i>=1;--i)
{
for(j=1;j<=i;++j)
{
printf("* ");
}
printf("\n");
}
return 0;
}
⽤ * 打印⾦字塔
*
* * *
* * * * *
* * * * * * *
* * * * * * * * *
源代码：
#include <stdio.h>
int main()
{
int i,space,rows,k=0;
printf("Enter the number of rows: "); scanf("%d",&rows);
for(i=1;i<=rows;++i)
{
for(space=1;space<=rows-i;++space) {
printf(" ");
}
while(k!=2*i-1)
{
printf("* ");
++k;
}
k=0;
printf("\n");
}
return 0;
}
⽤ * 打印倒⾦字塔
* * * * * * * * *
* * * * * * *
* * * * *
* * *
*
源代码：
int main()
{
int rows,i,j,space;
printf("Enter number of rows: ");
scanf("%d",&rows);
for(i=rows;i>=1;--i)
{
for(space=0;space<rows-i;++space)
printf(" ");
for(j=i;j<=2*i-1;++j)
printf("* ");
for(j=0;j<i-1;++j)
printf("* ");
printf("\n");
}
return 0;
}
5、简单的加减乘除计算器
源代码：
/* Source code to create a simple calculator for addition, subtraction, multiplication and division ase statement in C programming. */
# include <stdio.h>
int main()
{
char o;
float num1,num2;
printf("Enter operator either + or - or * or divide : ");
scanf("%c",&o);
printf("Enter two operands: ");
scanf("%f%f",&num1,&num2);
switch(o) {
case '+':
printf("%.1f + %.1f = %.1f",num1, num2, num1+num2);
break;
case '-':
printf("%.1f - %.1f = %.1f",num1, num2, num1-num2);
break;
case '*':
printf("%.1f * %.1f = %.1f",num1, num2, num1*num2);
break;
case '/':
printf("%.1f / %.1f = %.1f",num1, num2, num1/num2);
break;
default:
/
* If operator is other than +, -, * or /, error message is shown */
printf("Error! operator is not correct");
break;
}

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