Thread: array calculations

I have an array of strings, which allow a user to enter a name for the staff member, the amount they get paid and the hours they have worked. I want to multiply the pay by the hours (pay * hours, eg. $15.90 x 21hrs). I am confused on how to do this. The code I have so far is below.

Code:

#include<stdio.h>
int main (void)
{
	/*declare variables */
	int index1, index2;
	char staff[20][3][50];

	/*Allow a user to enter staff's details*/
	printf("Please enter the staff's name, pay classification (in $) and hours worked.\n");
				
		for (i = 0; i < numRows; i++)
		{
			for (j = 0; j < numCols; j++)
			{ 						
		 	           scanf("%s", staff[i][j]);
			}/*end (for (j = 0; j < numCols; ++j))*/

			putchar('\n');
					
		}/*end (for (i = 0; i < numRows; ++i))*/

printf("\n\n Name: %s, Pay class: %s, Hrs: %s\n", staff[0][0], staff[0][1], staff[0][2]);
	
     return 0;
}

//Hey iam new in c programming but check if this can help you out. I //did not use no array only to store the name. The rest is to store //float values. It works.

//I have an array of strings, which allow a user to enter a name for the staff member,
//the amount they get paid and the hours they have worked. I want to multiply the pay by the hours (pay * hours, eg. $15.90 x 21hrs).
//I am confused on how to do this. The code I have so far is below.

Code:

#include<stdio.h>
main()
{
	char name[20];    // variable for name. array of 20 characters
	float amtpayed;     // variable amount payed
	float hrworked;     // hours worked
	float totalpayed;   // total payed ( pay * hours)

	printf("Please enter your name? (and press enter)\n");
	scanf("%s",&name); // gets and store the name in the variable

	printf("What is the amount $ you get payed? (and press    enter)\n");
	scanf("%f",&amtpayed); // gets and store the value in the variable

	printf("What is the amount of hours worked? (and press enter)\n");
	scanf("%f",&hrworked); // gets and store the value in the variable

	totalpayed = amtpayed * hrworked;  // formula to get totalpayed
	
	printf("\n* Name is: %s * Total amount payed is: %0.2f dollars\n\n", name, totalpayed);  // print results
	return 0;
}

I think you are trying to do a multidimension array. But what you really need is a structure. You are using an array for the name which is fine. But for the pay and amount. You need to use float. Check your data types.

Tell me if this help you

Caleb

The only problem with structures is that I havent learnt them yet
I know how to set one up

Code:

struct Person {
char name[20];
float pay[20];
float hrs [20];
};
Person person[10];

But I do not know how to add data and sort through it yet.

hey try to use the variable totalpayed as double and then replace your present code of multiplication with the one below and test

totalpayed = (double) amtpayed * hrworked; // formula to get totalpayed

Here is in use of a simple structure. This is a structure that contains array members. You can only use the array of strings in the variables fname and lname.
To be more accurate you need to have a double, as enggabhinandan said. I see that dwk is helping you out too. But I don’t know if that will work, if he says so he knows what he is doing. It might work too.

Tell me if this help you out!
Caleb

Code:

/* Demonstrates a structure that has array members. */

#include <stdio.h>

/* Define and declare a structure to hold the data. */
/* It contains one float variable and two char arrays. */

  struct data{
      char fname[30];
      char lname[30];
      double pay;
      double hrs;
      double totalpayed;
 } rec;

  main()
{
     /* Input the data from the keyboard. */

     printf("Enter the Person first and last names?,\n");
     printf("separated by a space: ");
     scanf("%s %s", rec.fname, rec.lname);

     printf("\nEnter the $ amount payed per hour?: ");
     scanf("%lf", &rec.pay);

	 printf("\nEnter the amount of Hours worked?: ");
     scanf("%lf", &rec.hrs);

	 rec.totalpayed = rec.pay * rec.hrs;

     /* Display the information. */
     /* Note: %.2f specifies a floating-point value */
     /* to be displayed with two digits to the right */
     /* of the decimal point. */

     /* Display the data on the screen. */

     printf("\nPerson Name: %s %s Pay: $%.2lf Hrs: %.2lf Total pay: $%.2lf\n", rec.fname, rec.lname, rec.pay, rec.hrs, rec.totalpayed);

     return 0;
}

This is what I have so far

Code:

#include<stdio.h>

#define numRows 10 /* number of rows */

float payCalculation(struct staff staff[numRows]);

struct staff
{ 
	char name[50];
	float payClassification;
	float hoursWorked;
};

int main (void)
{
	struct staff staff[10];

for (i = 0; i < numRows; i++)
{
	printf("\nPlease enter the staff's name: ");
	fgets(employee[i].name, sizeof(staff[i].name), stdin);
	printf("\nPlease enter the staff's pay classification: ");
	fscanf(stdin, "%f", &staff[i].payClassification);
	printf("\nPlease enter the staff's hours worked: ");
	fscanf(stdin, "%f", &staff[i].hoursWorked);					
}/*end (for (i = 0; i < numRows; ++i))*/

printf("Name: %s Pay: payCalculation(employee[i])", employee[i].name);

	return 0;
}/*end main() function */

float payCalculation(struct staff staff[numRows])
{
	int i;
	float pay =  staff[i].payClassification *staff[i].hoursWorked;
        return pay;	
}

I am using the function to calculate the pay for each individual employee but I think I have done something wrong in setting up the function and printing out the pay.

Also in my for loop i am unable to enter data for the staffs name. It prints the string asking for the name but does not allow me to enter any data instead it skips and asks me to enter the pay classification is there away i can stop it skipping?