Order of operations c#











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I'm struggling with understanding why the following returns this value. Any help would be appreciated.



int ans = 10, v1 = 5, v2 = 7, v3 = 18;

ans += v1 + 10 * (v2-- / 5) + v3 / v2;

Console.WriteLine(ans);// prints 28


My thinking would be brackets first, division, multiplication then addition. So the steps would be:
v1 + 10 * (v2-- / 5) + v3 / v2




  1. (v2-- / 5)= 1.4, v2 is then set to 6.

  2. v3 / v2 = 3

  3. 10 * (v2-- / 5) = 14

  4. 5 + (14) +(3) = 12


Therefore, (ans += 12) = 22?






c# order-of-operations







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  • I have seen this, but I'm not sure where i'm going wrong. Isn't my logic correct in terms of that table? : msdn.microsoft.com/en-us/library/2bxt6kc4.aspx
    – 9B44FD
    Nov 10 at 8:42










  • Your first assumption is incorrect. ?(v2-- / 5) = 1 not 1.4, because it will produce an integer result
    – Martin Parkin
    Nov 10 at 8:42










  • So you are effectively left with 10 += 5 + 10 * 1 + 3 = 10 += 5 + 10 + 3 = 28
    – Martin Parkin
    Nov 10 at 8:46










  • Thanks Martin. Should have debbuged... X_X
    – 9B44FD
    Nov 10 at 8:46















up vote
0
down vote

favorite












I'm struggling with understanding why the following returns this value. Any help would be appreciated.



int ans = 10, v1 = 5, v2 = 7, v3 = 18;

ans += v1 + 10 * (v2-- / 5) + v3 / v2;

Console.WriteLine(ans);// prints 28


My thinking would be brackets first, division, multiplication then addition. So the steps would be:
v1 + 10 * (v2-- / 5) + v3 / v2




  1. (v2-- / 5)= 1.4, v2 is then set to 6.

  2. v3 / v2 = 3

  3. 10 * (v2-- / 5) = 14

  4. 5 + (14) +(3) = 12


Therefore, (ans += 12) = 22?






c# order-of-operations







share|improve this question
























  • I have seen this, but I'm not sure where i'm going wrong. Isn't my logic correct in terms of that table? : msdn.microsoft.com/en-us/library/2bxt6kc4.aspx
    – 9B44FD
    Nov 10 at 8:42










  • Your first assumption is incorrect. ?(v2-- / 5) = 1 not 1.4, because it will produce an integer result
    – Martin Parkin
    Nov 10 at 8:42










  • So you are effectively left with 10 += 5 + 10 * 1 + 3 = 10 += 5 + 10 + 3 = 28
    – Martin Parkin
    Nov 10 at 8:46










  • Thanks Martin. Should have debbuged... X_X
    – 9B44FD
    Nov 10 at 8:46













up vote
0
down vote

favorite









up vote
0
down vote

favorite











I'm struggling with understanding why the following returns this value. Any help would be appreciated.



int ans = 10, v1 = 5, v2 = 7, v3 = 18;

ans += v1 + 10 * (v2-- / 5) + v3 / v2;

Console.WriteLine(ans);// prints 28


My thinking would be brackets first, division, multiplication then addition. So the steps would be:
v1 + 10 * (v2-- / 5) + v3 / v2




  1. (v2-- / 5)= 1.4, v2 is then set to 6.

  2. v3 / v2 = 3

  3. 10 * (v2-- / 5) = 14

  4. 5 + (14) +(3) = 12


Therefore, (ans += 12) = 22?






c# order-of-operations







share|improve this question















I'm struggling with understanding why the following returns this value. Any help would be appreciated.



int ans = 10, v1 = 5, v2 = 7, v3 = 18;

ans += v1 + 10 * (v2-- / 5) + v3 / v2;

Console.WriteLine(ans);// prints 28


My thinking would be brackets first, division, multiplication then addition. So the steps would be:
v1 + 10 * (v2-- / 5) + v3 / v2




  1. (v2-- / 5)= 1.4, v2 is then set to 6.

  2. v3 / v2 = 3

  3. 10 * (v2-- / 5) = 14

  4. 5 + (14) +(3) = 12


Therefore, (ans += 12) = 22?






c# order-of-operations




c# order-of-operations






share|improve this question















share|improve this question













share|improve this question




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edited Nov 11 at 12:50









Zoe

10.6k73575




10.6k73575










asked Nov 10 at 8:36









9B44FD

32




32












  • I have seen this, but I'm not sure where i'm going wrong. Isn't my logic correct in terms of that table? : msdn.microsoft.com/en-us/library/2bxt6kc4.aspx
    – 9B44FD
    Nov 10 at 8:42










  • Your first assumption is incorrect. ?(v2-- / 5) = 1 not 1.4, because it will produce an integer result
    – Martin Parkin
    Nov 10 at 8:42










  • So you are effectively left with 10 += 5 + 10 * 1 + 3 = 10 += 5 + 10 + 3 = 28
    – Martin Parkin
    Nov 10 at 8:46










  • Thanks Martin. Should have debbuged... X_X
    – 9B44FD
    Nov 10 at 8:46


















  • I have seen this, but I'm not sure where i'm going wrong. Isn't my logic correct in terms of that table? : msdn.microsoft.com/en-us/library/2bxt6kc4.aspx
    – 9B44FD
    Nov 10 at 8:42










  • Your first assumption is incorrect. ?(v2-- / 5) = 1 not 1.4, because it will produce an integer result
    – Martin Parkin
    Nov 10 at 8:42










  • So you are effectively left with 10 += 5 + 10 * 1 + 3 = 10 += 5 + 10 + 3 = 28
    – Martin Parkin
    Nov 10 at 8:46










  • Thanks Martin. Should have debbuged... X_X
    – 9B44FD
    Nov 10 at 8:46
















I have seen this, but I'm not sure where i'm going wrong. Isn't my logic correct in terms of that table? : msdn.microsoft.com/en-us/library/2bxt6kc4.aspx
– 9B44FD
Nov 10 at 8:42




I have seen this, but I'm not sure where i'm going wrong. Isn't my logic correct in terms of that table? : msdn.microsoft.com/en-us/library/2bxt6kc4.aspx
– 9B44FD
Nov 10 at 8:42












Your first assumption is incorrect. ?(v2-- / 5) = 1 not 1.4, because it will produce an integer result
– Martin Parkin
Nov 10 at 8:42




Your first assumption is incorrect. ?(v2-- / 5) = 1 not 1.4, because it will produce an integer result
– Martin Parkin
Nov 10 at 8:42












So you are effectively left with 10 += 5 + 10 * 1 + 3 = 10 += 5 + 10 + 3 = 28
– Martin Parkin
Nov 10 at 8:46




So you are effectively left with 10 += 5 + 10 * 1 + 3 = 10 += 5 + 10 + 3 = 28
– Martin Parkin
Nov 10 at 8:46












Thanks Martin. Should have debbuged... X_X
– 9B44FD
Nov 10 at 8:46




Thanks Martin. Should have debbuged... X_X
– 9B44FD
Nov 10 at 8:46












2 Answers
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v2-- / 5)= 1.4 and there is your problem. Integer division will never return a non integer value.



1/2 equals 0, not 0.5 and 7/5 equals 1, not 1.4.






share|improve this answer






























    up vote
    0
    down vote













    Martin: Step 1. is incorrect because both variables are integers the result will be an integer, (v2-- / 5) = 1. To get the answer of 1.4 one would need to change the variables to type double.
    "So you are effectively left with 10 += 5 + 10 * 1 + 3= 28"






    share|improve this answer





















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      2 Answers
      2






      active

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      2 Answers
      2






      active

      oldest

      votes









      active

      oldest

      votes






      active

      oldest

      votes








      up vote
      1
      down vote



      accepted










      v2-- / 5)= 1.4 and there is your problem. Integer division will never return a non integer value.



      1/2 equals 0, not 0.5 and 7/5 equals 1, not 1.4.






      share|improve this answer



























        up vote
        1
        down vote



        accepted










        v2-- / 5)= 1.4 and there is your problem. Integer division will never return a non integer value.



        1/2 equals 0, not 0.5 and 7/5 equals 1, not 1.4.






        share|improve this answer

























          up vote
          1
          down vote



          accepted







          up vote
          1
          down vote



          accepted






          v2-- / 5)= 1.4 and there is your problem. Integer division will never return a non integer value.



          1/2 equals 0, not 0.5 and 7/5 equals 1, not 1.4.






          share|improve this answer














          v2-- / 5)= 1.4 and there is your problem. Integer division will never return a non integer value.



          1/2 equals 0, not 0.5 and 7/5 equals 1, not 1.4.







          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited Nov 10 at 8:43

























          answered Nov 10 at 8:38









          InBetween

          24.6k33967




          24.6k33967
























              up vote
              0
              down vote













              Martin: Step 1. is incorrect because both variables are integers the result will be an integer, (v2-- / 5) = 1. To get the answer of 1.4 one would need to change the variables to type double.
              "So you are effectively left with 10 += 5 + 10 * 1 + 3= 28"






              share|improve this answer

























                up vote
                0
                down vote













                Martin: Step 1. is incorrect because both variables are integers the result will be an integer, (v2-- / 5) = 1. To get the answer of 1.4 one would need to change the variables to type double.
                "So you are effectively left with 10 += 5 + 10 * 1 + 3= 28"






                share|improve this answer























                  up vote
                  0
                  down vote










                  up vote
                  0
                  down vote









                  Martin: Step 1. is incorrect because both variables are integers the result will be an integer, (v2-- / 5) = 1. To get the answer of 1.4 one would need to change the variables to type double.
                  "So you are effectively left with 10 += 5 + 10 * 1 + 3= 28"






                  share|improve this answer












                  Martin: Step 1. is incorrect because both variables are integers the result will be an integer, (v2-- / 5) = 1. To get the answer of 1.4 one would need to change the variables to type double.
                  "So you are effectively left with 10 += 5 + 10 * 1 + 3= 28"







                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered Nov 10 at 9:00









                  9B44FD

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