Program to Open a file, read a file and write to a file

#include
int main()
{
float sales , commission;
FILE *fin, *fout;
fin = fopen("c:\\pop.dat","r");
fout = fopen("c:\\pop2.dat","w");
while (fscanf(fin,"%f",&sales) != EOF)
{
fprintf(fout,"Your sales for the year were %8.2f \n",sales);
if(sales < 30000)
commission = sales / 100 * 5;
else
commission = sales / 100 * 10;
fprintf(fout,"Your commission is %8.2f",commission);
}
return 0;
}

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;
}

A simple example showing some comparison operators

#include
int main()
{
int number1 , number2;
printf("Enter the number1 number to compare.\n");
scanf("%d",&number1);
printf("Enter the number2 number to compare.\n");
scanf("%d",&number2);
printf("number1 > number2 has the value %d\n", number1 > number2);
printf("number1 < number2 has the value %d\n", number1 < number2);
printf("number1 == number2 has the value %d\n", number1 == number2);
return 0;
}

count occurrences of values in an array

#include
void print_arr(int grades[], int elements);
int count_passes(int grades[], int elements,int value);

int main(void)
{
int grades[10] = {70,80,95,65,35,85,54,78,45,68};
int result;
print_arr(grades,10);
result = count_passes(grades,10,70);
if(result == 1)
printf("There was %d pass.\n",result);
else
printf("There were %d passes.\n",result);
return 0;
}

void print_arr(int grades[], int elements)
{
int i;

for(i = 0;i < elements;i++)
{
printf("%d ",grades[i]);
}
printf("\n");
}

int count_passes(int grades[], int elements,int value)
{
int i ,passes = 0 ;
for(i = 0;i < elements;i++)
{
if(grades[i] >= value)
passes++;
}
return(passes);
}

This program calculates an average of the numbers entered

#include
int Average(int i);

int main()
{
int num;
do
{
printf("Enter numbers.\n");
scanf("%d",&num);
if(num != -1)
printf("The average is %d", Average(num));
printf("\n");

}while(num>-1);

return 0;
}

int Average(int i)
{
static int sum = 0, count = 0;
sum = sum + i;
count++;
return sum / count;
}

A bubblesort 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;
}
}

SUM OF ARRAY

WAP to sum of five elements of an array

void main ()

{

int no[5],i,sum;

clrscr ();

for (i=0;i<=4;i++)

{

printf ("Enter Element: ");

scanf ("%d",&no[i]);

}

sum=no[0]+no[1]+no[2]+no[3]+no[4];

printf ("\nSum of five Elements: %d",sum);

getch ();

}