Problems with a program [C arrays]

You should change this:

printf("Total= %d", &total_kWh);

to that:

printf("Total= %d", total_kWh);

Same is true for all your other integer variables.

There were quite a few mistakes in your code:

• you printed the memory-address instead of result value (don't use & with printf if your variable is a plain int)
• the computer for-loop had no curly brackets (so only the printf statement was looped)
• results were not summed up (in all loops you've just overwritten your inputs from the last loop)
• the rooms[] Array was never used - a few other variables also (possible error source, if you wanted to use them and just forgot it)
• the result from a multiplication with 1.5 will hold a double value - you should cast that back to int (dishLoad)

The bold mistake is probably that one, why your values were wrong... Also notice: The 'average number of washing machine loads/clothes dryer loads/ dishwasher loads' should better be asked by week or month... Or should hold Floating Point values: Because everyone I know don't use the washing machine and clothes dryer every day multiple times. So now you can't enter something like once a week (which would be an factor of 0.14, but is not enterable cause all values are stored as int).

Here Comes the code with everything fixed, I could found:

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <math.h>

int main(int argc, char** argv){
  int i = 0;
  int rooms = 0;
  int lights = 0; 
  int hrsUsed = 0; 
  int Telly = 0;
  int TVWatt =0;
  int sumTV = 0;
  int TVuse = 0;
  int Computer = 0;
  int compWatt = 0;
  int compUsed = 0;
  int compTotal= 0;
  int kwH_lights = 0;
  int fridge = 0;
  int washLoad = 0;
  int dryerLoad = 0, dishLoad = 0, cookLoad = 0;
  int showeruse = 0;
  int total_kWh = 0;

  printf("Enter number of rooms: ");
  scanf_s("%d", &rooms);

  for(i=0;i<rooms;i++){
    printf("A few questions about room %d\n", i+1);
    printf("input average wattage of lights: ");
    scanf_s("%d", &lights);
    lights+=lights/1000;
    printf("input number of hours use/day (average): ");
    scanf_s("%d", &hrsUsed);
    kwH_lights+=((lights*hrsUsed)*365);
    printf("input number of TVs: ");
    scanf_s("%d", &Telly);
    printf("input average wattage: ");
    scanf_s("%d", &TVWatt);
    printf("input average use a day: ");
    scanf_s("%d", &TVuse);
    sumTV+=((Telly*(TVWatt/1000))*TVuse)*365;
  }
  printf("Input number of fridge/freezer: ");
  scanf_s("%d",&fridge);
  fridge=(fridge*2)*365;
  printf("input number of Computers and/or video game consoles in the house: ");
  scanf_s("%d", &Computer);

  for(i=0;i<Computer;i++){
    printf("A few questions about computer %d\n", i+1);
    printf("input  wattage: ");
    scanf_s("%d", &compWatt);
    printf("input average hrs used/day: ");
    scanf_s("%d", &compUsed);
    compTotal += ((compWatt/1000)*compUsed)*365;
  }

  printf("Input average number of washing machine loads/day: ");
  scanf_s("%d",&washLoad);
  washLoad=washLoad*365;
  printf("Input average number of clothes dryer loads/day: ");
  scanf_s("%d",&dryerLoad);
  dryerLoad=(dryerLoad*3)*365;
  printf("Input average number of dishwasher loads/day: ");
  scanf_s("%d",&dishLoad);
  dishLoad=(int)((dishLoad*1.5)*365);
  printf("Input average cooking load/day: ");
  scanf_s("%d",&cookLoad);
  cookLoad=(cookLoad*7)*365;
  printf("Input average hrs/day of shower usage: ");
  scanf_s("%d",&showeruse);
  showeruse=(showeruse*7)*365;

  total_kWh=((kwH_lights)+(sumTV)+(fridge)+(compTotal)+(dryerLoad)+(dishLoad)+(cookLoad)+(showeruse));
  printf("Total= %d\n", total_kWh);
  system("Pause");
  return 0;
}

I hope it helps you out - if you got any questions left, feel free to ask.

My first step would be to correct the second for loop { } ... fix this and ask again.

[EDIT] your calculations with usages of int values divided by other ints (compwatt / 1000) ... are you sure your idea of using int is correct?

or:

cookLoad=(cookLoad*7)*365;

why multiplying with 7 AND 365? should not the average / day be multiplied by 365 only?

For more readability of your code, you can employ compound assignment operators as below,

   Operator Name             Syntax    Meaning
-------------------------------------------------
Addition assignment         a += b    a = a + b 
Subtraction assignment      a -= b    a = a - b
Multiplication assignment   a *= b    a = a * b
Division assignment         a /= b    a = a / b