C Programming : সি প্রোগ্রামিং

Your First C Program Here, is a Hello World program in C #include<stdio.h> //Pre-processor directive void main() //main function declaration { printf("Hello World"); //to output the string on a display getch (); //terminating function } Here is the code explanation: Pre-processor directive #include is a pre-processor directive in 'C.' #include <stdio.h> , stdio is the library where the function printf is defined . printf is used for generating output. Before using this function, we have to first include the required file, also known as a header file (.h). You can also create your own functions, group them in header files and declare them at the top of the program to use them. To include a file in a program, use pre-processor directive #include <file-name>.h File-name is the name of a file in which the functions are stored. Pre-processor directives are always placed at the beginning of the program. The main function The

Count no. of students above,below and average students   #include<stdio.h>   #include<conio.h>    void main()     {      int a[10];      int aa=0,ba=0,ae=0,i;      clrscr();      printf("Enter the marks:\n");      for(i=0;i<10;i++)        { scanf("%d",&a[i]); if(a[i]>55) aa++; else if(a[i]<55) ba++; else ae++;        }      printf("No. OF AVG STUDENTS ARE:%d\n",ae);      printf("No. OF ABOVE AVERAGE STUDENTS:%d\n",aa);      printf("No. OF BELOW AVERAGE STUDENTS ARE:%d",ba);     getch();    }

Basic example showing constants usage in C #include /*constants for bonus rates and sales*/ #define BONUSRATE1 0.1 #define BONUSRATE2 0.15 #define BONUSRATE3 0.2 #define SALES1 2000 #define SALES2 5000 #define SALES3 10000 int main() { int sales; double commission; /*get employees sales*/ printf("Please enter your total sales to the nearest dollar.\n"); scanf("%d", &sales); /*calculate employees bonus based on info*/ if(sales <=2000) { commission = sales * BONUSRATE1; printf("%g\n" , commission); } else if(sales > 2000 && sales <=5000) { commission = sales * BONUSRATE2; printf("%g\n" , commission); } else { commission = sales * BONUSRATE3; printf("%g\n" , commission); } return 0; }

ATM programing ATM C programing language Program code  ‎/*Note Pin code is 1234*/ #include<stdio.h> #include<conio.h> void main(void) { unsigned long amount=1000,deposit,withdr​aw; int choice,pin=0,k=0; char another='y'; while(pin!=1234) { clrscr(); gotoxy(30,25); printf("Enter pin:"); scanf("%d",&pin); } clrscr(); do { printf("********Welcome to ATM Service**************\n"); printf("1. Check Balance\n"); printf("2. Withdraw Cash\n"); printf("3. Deposit Cash\n"); printf("4. Quit\n"); printf("******************​**************************​*\n\n"); printf("Enter your choice: "); scanf("%d",&choice); switch(choice) { case 1: printf("\nYour Balance is Rs : %lu ",amount); break; case 2: printf("\nEnter the amount to withdraw: "); scanf("%lu",&withdraw); if(withdraw%100!=0) { printf("\

ARRANGE THE ELEMENTS IN ARRAY IN DESCENDING ORDER main() { int a[100],i,n,j,search,temp; printf("\n how many no's in array"); scanf("%d",&n); printf("\n enter %d elements in array",n); for(i=0;i scanf("%d",&a[i]); for(i=0;i { for(j=i+1;j { if(a[i] { temp=a[i]; a[i]=a[j]; a[j]=temp; } } printf("%4d",a[i]); } getch(); }

Add Two numbers without using operator #include<stdio.h> int main (){        int a , b ;     int sum ;     printf ( "Enter any two integers: " );     scanf ( "%d%d" ,& a ,& b );     //sum = a - (-b);     sum = a - ~ b - 1 ;     printf ( "Sum of two integers: %d" , sum );     return 0 ; }

Add two matrices and store the result #include<stdio.h> #include<conio.h> void main() { int a[3][3],b[3][3],c[3][3],i,j; clrscr(); printf("Enter the elements into matrix A\n"); for(i=0;i<3;i++) for(j=0;j<3;j++) scanf("%d",&a[i][j]); printf("\nEnter the elements into matrix B\n"); for(i=0;i<3;i++) for(j=0;j<3;j++) scanf("%d",&b[i][j]); for(i=0;i<3;i++) for(j=0;j<3;j++) c[i][j]=a[i][j]+b[i][j]; for(i=0;i<3;i++) { printf("\t\t"); for(j=0;j<3;j++) printf("%d\t",c[i][j]); printf("\n\a"); } getch(); }

Add Pointers #include<stdio.h> #include<conio.h>  void main()  {  int a[10],sum=0;  int *j;  int i,n;  clrscr();  printf("Enter how many elements u want to add:");  scanf("%d",&n);  printf("Enter the elements:");  for(i=0;i<n;i++)  {  scanf("%d",&a[i]);  }   j=&a[0];  for(i=0;i<n;i++)      {        sum=sum+*j;        j++;      }  printf("sum=%d",sum); }

Add numbers using command line arguments (CLA) #include<stdio.h> #include<conio.h> #include<stdlib.h> void main(int argc,char *argv[]) { int sum=0,i; //Compare if proper number of arguments have been entered if(argc<3) { printf("Insufficient number of arguments:\n"); getch(); return 0; } //Add all the numbers entered using atoi function for(i=1;i<argc;i++) { sum+=atoi(argv[i]); } //print the sum printf("Ans=%d",sum); getch(); }

A bubble sort routine # include # include void bubblesort(int array[],int size); void main() { int values[10],j; for(j=0;j<10;j++) values[j] = rand()%100; /*unsorted*/ printf("\nUnsorted values.\n"); for(j=0;j<10;j++) printf("%d ",values[j]); /*sorted*/ printf("\nSorted values.\n"); bubblesort(values,10); for(j=0;j<10;j++) printf("%d ",values[j]); } void bubblesort(int array[],int size) { int tmp ,i,j; for(i = 0;i for(j=0;j < size;j++) if(array[i] < array[j]) { tmp = array[i]; array[i] = array[j]; array[j] = tmp; } }