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[導讀]算法是附源碼一個程序和軟件的靈魂，作為一名優秀的語言經程序員，只有對一些基礎的典算算法有著全面的掌握，才會在設計程序和編寫代碼的法例過程中顯得得心應手。本文是附源碼近百個C語言算法系列的第二篇，包括了經典的語言經Fibonacci數列、簡易計算器、典算回文檢查、法例質數檢查等算法。附源碼也許他們能在你的語言經畢業設計或者面試中派上用場。

素材來源：電子工程專輯

算法是典算一個程序和軟件的靈魂，作為一名優秀的法例程序員，只有對一些基礎的附源碼算法有著全面的掌握，才會在設計程序和編寫代碼的語言經過程中顯得得心應手。本文是典算近百個C語言算法系列的第二篇，包括了經典的Fibonacci數列、簡易計算器、回文檢查、質數檢查等算法。也許他們能在你的畢業設計或者面試中派上用場。

1、計算Fibonacci數列

Fibonacci數列又稱斐波那契數列，又稱黃金分割數列，指的是這樣一個數列：1、1、2、3、5、8、13、21。

C語言實現的代碼如下：

/* Displaying Fibonacci sequence up to nth term where n is entered by user. */#include 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{ display=t1+t2;t1=t2;t2=display;++count;printf("%d+",display);}return 0;}

結果輸出：

Enter number of terms: 10Fibonacci Series: 0+1+1+2+3+5+8+13+21+34+

也可以使用下面的源代碼：

/* Displaying Fibonacci series up to certain number entered by user. */
#include int main(){ int t1=0, t2=1, display=0, num;printf("Enter an integer: ");scanf("%d",&num);printf("Fibonacci Series: %d+%d+", t1, t2); /* Displaying first two terms */display=t1+t2;while(display{ printf("%d+",display);t1=t2;t2=display;display=t1+t2;}return 0;}

結果輸出：

Enter an integer: 200Fibonacci Series: 0+1+1+2+3+5+8+13+21+34+55+89+144+

2、回文檢查

源代碼：

/* C program to check whether a number is palindrome or not */
#include 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);elseprintf("%d is not a palindrome.",n);return 0;}

結果輸出：

Enter an integer: 1232112321 is a palindrome.

3、質數檢查

注：1既不是質數也不是合數。

源代碼：

/* C program to check whether a number is prime or not. */
#include 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);elseprintf("%d is not a prime number.",n);return 0;}

結果輸出：

Enter a positive integer: 2929 is a prime number.

4、打印金字塔和三角形

使用 * 建立三角形

** ** * ** * * ** * * * *

源代碼：

#include int main(){ int i,j,rows;printf("Enter the number of rows: ");scanf("%d",&rows);//微信搜索公眾號【C語言中文社區】關注回復C語言，免費領取200G學習資料for(i=1;i<=rows;++i){ for(j=1;j<=i;++j){ printf("* ");}printf("\n");}return 0;}

如下圖所示使用數字打印半金字塔。

11 21 2 31 2 3 41 2 3 4 5

源代碼：

#include 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

* * * * ** * * ** * ** **

源代碼：

#include int main(){ int i,j,rows;printf("Enter the number of rows: ");scanf("%d",&rows);for(i=rows;i>=1;--i){ for(j=1;j<=i;++j){ printf("* ");}printf("\n");}return 0;}

用 * 打印金字塔

** * ** * * * ** * * * * * ** * * * * * * * *

源代碼：

#include 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

* * * * * * * * ** * * * * * ** * * * ** * **

源代碼：

#includeint main(){ int rows,i,j,space;printf("Enter number of rows: ");scanf("%d",&rows);for(i=rows;i>=1;--i){ for(space=0;spaceprintf(" ");for(j=i;j<=2*i-1;++j)printf("* ");for(j=0;jprintf("* ");printf("\n");}return 0;}

5、簡單的加減乘除計算器

源代碼：

/* Source code to create a simple calculator for addition, subtraction, multiplication and division using switch...case statement in C programming. */
# include 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;}return 0;}

結果輸出：

Enter operator either + or - or * or divide : -Enter two operands: 3.48.43.4 - 8.4 = -5.0

6、檢查一個數能不能表示成兩個質數之和

源代碼：

#include int prime(int n);int main(){ int n, i, flag=0;//微信搜索公眾號【C語言中文社區】關注回復C語言，免費領取200G學習資料printf("Enter a positive integer: ");scanf("%d",&n);for(i=2; i<=n/2; ++i){ if (prime(i)!=0){ if ( prime(n-i)!=0){ printf("%d = %d + %d\n", n, i, n-i);flag=1;}
}}if (flag==0)printf("%d can't be expressed as sum of two prime numbers.",n);return 0;}int prime(int n) /* Function to check prime number */{ int i, flag=1;for(i=2; i<=n/2; ++i)if(n%i==0)flag=0;return flag;}

結果輸出：

Enter a positive integer: 3434 = 3 + 3134 = 5 + 2934 = 11 + 2334 = 17 + 17

7、用遞歸的方式顛倒字符串

源代碼：

/* Example to reverse a sentence entered by user without using strings. */
#include void Reverse();int main(){ printf("Enter a sentence: ");Reverse();return 0;}void Reverse(){ char c;scanf("%c",&c);if( c != '\n'){ Reverse();printf("%c",c);}}

結果輸出：

Enter a sentence: margorp emosewaawesome program

8、實現二進制與十進制之間的相互轉換

/* C programming source code to convert either binary to decimal or decimal to binary according to data entered by user. */
#include #include int binary_decimal(int n);int decimal_binary(int n);int main(){ int n;char c;printf("Instructions:\n");printf("1. Enter alphabet 'd' to convert binary to decimal.\n");printf("2. Enter alphabet 'b' to convert decimal to binary.\n");scanf("%c",&c);if (c =='d' || c == 'D'){ printf("Enter a binary number: ");scanf("%d", &n);printf("%d in binary = %d in decimal", n, binary_decimal(n));}if (c =='b' || c == 'B'){ printf("Enter a decimal number: ");scanf("%d", &n);printf("%d in decimal = %d in binary", n, decimal_binary(n));}return 0;}
int decimal_binary(int n) /* Function to convert decimal to binary.*/{ int rem, i=1, binary=0;while (n!=0){ rem=n%2;n/=2;binary+=rem*i;i*=10;}return binary;}
int binary_decimal(int n) /* Function to convert binary to decimal.*/{ int decimal=0, i=0, rem;while (n!=0){ rem = n%10;n/=10;decimal += rem*pow(2,i);++i;}return decimal;}

9、使用多維數組實現兩個矩陣的相加

源代碼：

#include int main(){ int r,c,a[100][100],b[100][100],sum[100][100],i,j;printf("Enter number of rows (between 1 and 100): ");scanf("%d",&r);printf("Enter number of columns (between 1 and 100): ");scanf("%d",&c);printf("\nEnter elements of 1st matrix:\n");
/* Storing elements of first matrix entered by user. */
for(i=0;ifor(j=0;j{ printf("Enter element a%d%d: ",i+1,j+1);scanf("%d",&a[i][j]);}
/* Storing elements of second matrix entered by user. */
printf("Enter elements of 2nd matrix:\n");for(i=0;ifor(j=0;j{ printf("Enter element a%d%d: ",i+1,j+1);scanf("%d",&b[i][j]);}
/*Adding Two matrices */
for(i=0;ifor(j=0;jsum[i][j]=a[i][j]+b[i][j];
/* Displaying the resultant sum matrix. */
printf("\nSum of two matrix is: \n\n");for(i=0;ifor(j=0;j{ printf("%d ",sum[i][j]);if(j==c-1)printf("\n\n");}
return 0;}

10、矩陣轉置

源代碼：

#include int main(){ int a[10][10], trans[10][10], r, c, i, j;printf("Enter rows and column of matrix: ");scanf("%d %d", &r, &c);
/* Storing element of matrix entered by user in array a[][]. */printf("\nEnter elements of matrix:\n");for(i=0; ifor(j=0; j{ printf("Enter elements a%d%d: ",i+1,j+1);scanf("%d",&a[i][j]);}/* Displaying the matrix a[][] */printf("\nEntered Matrix: \n");for(i=0; ifor(j=0; j{ printf("%d ",a[i][j]);if(j==c-1)printf("\n\n");}
/* Finding transpose of matrix a[][] and storing it in array trans[][]. */for(i=0; ifor(j=0; j{ trans[j][i]=a[i][j];}
/* Displaying the transpose,i.e, Displaying array trans[][]. */printf("\nTranspose of Matrix:\n");for(i=0; ifor(j=0; j{ printf("%d ",trans[i][j]);if(j==r-1)printf("\n\n");}return 0;}

結果輸出：

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