Search an array

#include
void print_arr(int myArray[], int elements);
int search_arr(int myArray[], int elements, int number);

int main(void)
{
int myArray[10] = {12,23,56,35,18,65,12,87,73,9};
int result,number;
print_arr(myArray,10);
number = 65;
result = search_arr(myArray,10,number);
if(result == -1)
printf("%d was not found.\n",number);
else
printf("Found %d\n",result);
return 0;
}

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

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

int search_arr(int myArray[], int elements, int number)
{
int i;
for(i = 0;i < elements;i++)
{
if(myArray[i] == number)
return(number);
}
return(-1);
}

program to calculate sum all of the elments in an array

#include
void print_arr(int myArray[], int elements);
int sum_arr(int myArray[], int elements);

int main(void)
{
int myArray[5] = {78,34,25,98,12 };
int sum;
printf("Array info: ");
print_arr(myArray,5);
sum = sum_arr(myArray,5);
printf("The sum of the array is : %d\n",sum);
return 0;
}

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

int sum_arr(int myArray[], int elements)
{
int i, sum = 0;
for(i = 0;i < elements;i++)
{
sum = sum + myArray[i];
}
return(sum);
}

Program to find whether a number is odd or even

#include
int main()
{
int number ;
printf("Enter a whole number\n");
scanf("%d",&number);
if(number % 2 == 0)
printf("number is even.\n");
else
printf("number is odd.\n");

return 0;
}

calculate the power in watts

#include
int main()
{
float power,voltage,current;
voltage = current = 0;

printf("Power calculator.\n");
printf("This will calculate the power in watts , ");
printf("when you input the voltage and current.");
/*get the voltage*/
printf("Enter the voltage in volts.\n");
scanf("%f",&voltage);
/*get the current*/
printf("Enter the current in amps.\n");
scanf("%f",¤t);
/*calculate the power*/
power = voltage * current;
printf("The power in watts is %.2f watts\n",power);

return 0;
}

Ohms law example In C

#include
#include
#include
int main()
{
char ch;
float voltage , current , resistance , result;
printf("Ohms law calculator.\n");
printf("Please choose from following calculcations.\n");
printf("1. choose 1 to calculate the voltage.\n");
printf("2. choose 2 to calculate the current.\n");
printf("3. choose 3 to calculate the resistance.\n");
printf("Anything else to quit.\n");
scanf("%c",&ch);
switch(ch)
{
case '1' :
printf("please enter the current in amps.\n");
scanf("%f",¤t);
printf("Now enter the resistance in ohms.\n");
scanf("%f",&resistance);
result = current * resistance;
printf("The voltage is %0.2f volts.\n",result);
break;
case '2' :
printf("please enter the voltage in volts.\n");
scanf("%f",&voltage);
printf("Now enter the resistance in ohms.\n");
scanf("%f",&resistance);
result = voltage / resistance;
printf("The current is %0.2f amps.\n",result);
break;
case '3' :
printf("please enter the voltage in volts.\n");
scanf("%f",&voltage);
printf("Now enter the current in amps.\n");
scanf("%f",¤t);
result = voltage / current;
printf("The resistance is %0.2f ohms.\n",result);
break;
default :
exit(0);
break;
}
return 0;
}

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;
}