C# programming language is a structure oriented programming language. Here some codes of C# programming that helps of you learn c# programming.
- Copy the String
- Counting Frequencies Of Elements Of Array
- Count the Digit in a Number
- Factorial
- Fibonacci Series
- File-Copy one file contents to another
- File Example
- File-How the data stored on the disk is read
- File-File operations
- Find The Roots Of A Quadratic Equation
| Name |
Code |
Copy the String
|
#include<stdio.h>
void stringCopy(char[],char[]);
int main()
{
char str1[100],str2[100];
printf("Enter any string: ");
scanf("%s",str1);
stringCopy(str1,str2);
printf("After copying: %s",str2);
return 0;
}
void stringCopy(char str1[],char str2[])
{
int i=0;
while(str1[i]!=\'\u0000\')
{
str2[i] = str1[i];
i++;
}
str2[i]=\'\u0000\';
}
|
Counting Frequencies Of Elements Of Array
|
#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
#define S 6
main()
{
int a[S], freq[S];
int i, j, k,n = S;
clrscr();
for(i = 0; i < S; i++)
{
printf(" \n Enter a[%d] element: ", i);
scanf(" %d ", &a[i]);
freq[i] = 1;
}
printf(" Original Array\n ");
for(i = 0; i < S; i++)
printf(" %d ", a[i]);
/* Main Logic Starts Here */
for(i = 0; i < n; i++)
for(j = i + 1; j < n; j++)
{
if(a[i] == a[j])
{
for(k = j; k < n; k++)
a[k] = a[k+1];
freq[i]++;
n--;
}
}
printf(" \nArray with freq\n ");
printf(" \nElement Freq\n ");
for(i = 0; i < n; i++)
printf("%d %d\n ", a[i], freq[i]);
getch();
}
|
Count the Digit in a Number
|
#include<stdio.h>
int main()
{
int num,count=0;
printf("Enter a number: ");
scanf("%d",&num);
while(num)
{
num=num/10;
count++;
}
printf("Total digits is:%d",count);
return 0;
}
|
Factorial
|
#include <stdio.h>
#include <conio.h>
long int factorial(int n);
void main()
{
int n;
clrscr();
printf("Enter the number:\n");
scanf("%d",&n);
printf("Factorial of %d is %ld",n,factorial(n));
getch();
}
long int factorial(int n)
{
if(n<=1)
{
return(01);
}
else
{
n=n*factorial(n-1);
return(n);
}
}
|
Fibonacci Series
|
#include <stdio.h>
#include <conio.h>
long int factorial(int n);
void main()
{
int n;
clrscr();
printf("Enter the number:\n");
scanf("%d",&n);
printf("Factorial of %d is %ld",n,factorial(n));
getch();
}
long int factorial(int n)
{
if(n<=1)
{
return(01);
}
else
{
n=n*factorial(n-1);
return(n);
}
}
|
File-Copy one file contents to another
|
#include <stdio.h>
#include <conio.h>
#include <process.h>
void main(int argc, char *argv[])
{
FILE *fs,*ft;
char ch;
clrscr();
if(argc!=3)
{
puts("Invalid number of arguments.");
exit(0);
}
fs = fopen(argv[1],"r");
if(fs==NULL)
{
puts("Source file cannot be opened.");
exit(0);
}
ft = fopen(argv[2],"w");
if (ft==NULL)
{
puts("Target file cannot be opened.");
fclose(fs);
exit(0);
}
while(1)
{
ch=fgetc(fs);
if (ch==EOF)
break;
else
fputc(ch,ft);
}
fclose(fs);
fclose(ft);
getch();
}
|
File Example
|
#include<stdio.h>
int main()
{
FILE *fp;
char ch;
fp=fopen("file.txt","w");
printf("\nEnter data to be stored in to the file:");
while((ch=getchar())!=EOF)
putc(ch,fp);
fclose(fp);
return 0;
}
|
File-How the data stored on the disk is read
|
#include <stdio.h>
#include <stdlib.h>
void main()
{
FILE *fptr;
char filename[15];
char ch;
printf("Enter the filename to be opened\n");
gets(filename);
fptr = fopen (filename, "r"); /*open for reading*/
if (fptr == NULL)
{
printf("Cannot open file\n");
exit(0);
}
ch = fgetc(fptr);
while (ch != EOF)
{
printf ("%c", ch);
ch = fgetc(fptr);
}
fclose(fptr);
}
|
File-File operations
|
#include <stdio.h>
void main()
{
FILE *fptr;
char name[20];
int age;
float salary;
fptr = fopen ("emp.txt", "w"); /*open for writing*/
if (fptr == NULL)
{
printf("File does not exists \n");
return;
}
printf("Enter the name\n");
scanf("%s", name);
fprintf(fptr, "Name = %s\n", name);
printf("Enter the age\n");
scanf("%d", &age);
fprintf(fptr, "Age = %d\n", age);
printf("Enter the salary\n");
scanf("%f", &salary);
fprintf(fptr, "Salary = %.2f\n", salary);
fclose(fptr);
}
|
Find The Roots Of A Quadratic Equation
|
#include <stdio.h>
#include <conio.h>
#include <math.h>
void main()
{
float a, b, c, d, realp, imgp, r1, r2;
clrscr();
printf(" Enter the 3 numbers\n ");
scanf(" %f %f %f " ,&a, &b, &c);
if ( a == 0 || b == 0 || c == 0 )
{
printf(" Error input only non zero numbers\n ");
}
else
{
d = b * b - 4 * a * c;
if ( d == 0 )
{
printf(" Roots are equal\n ");
r1 = r2 = - b / ( 2 * a );
printf(" Root1 = %f, Root2 = %f ", r1, r2 );
}
else if(d>0)
{
printf( "Roots are real & distinct\n" );
r1 = ( - b + sqrt ( fabs ( d ) ) ) / ( 2 * a );
r2 = ( - b - sqrt ( fabs ( d ) ) ) / ( 2 * a );
printf(" Root1 = %f, Root2 = %f", r1, r2);
}
else
{
printf(" Roots are imaginary\n ");
realp = - b / ( 2 * a );
imgp = sqrt ( fabs ( d ) ) / ( 2 * a );
printf(" Root1 = %f + i%f, Root2 = %f - i%f ",realp, imgp, realp, imgp);
}
}
getch();
}
|
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Reviewed by Abdul hanan
on
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