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I'm writing a C code with the idea create a function input numbers into 2 arrays(Read_data) function. Then I will call it in the main function and print out those 2 arrays' elements. My relative code is as below:
 #define NUMBER 3
 void Read_data(double* x, double* y)
// 座標値格納配列宣言
 for (int i = 0; i < NUMBER; i++)
    printf_s("x[%d]= ", i);
    scanf_s("%3f", &x[i]);
 for (int i = 0; i < NUMBER; i++)
    printf_s("y[%d]= ", i);
    scanf_s("%3f", &y[i]);
int main()
  double X[NUMBER], Y[NUMBER];
  for (int i = 0; i < NUMBER; i++)
    printf("X[%d]= %f\n", i, X[i]);
  for (int i = 0; i < NUMBER; i++)
    printf("Y[%d]= %f\n", i, Y[i]);

But when I compiled it first I input the numbers and then it appears very strange numbers that I don't know what type of errors cause this.
I will text out those number because I can't paste the picture there
x[0]= 5
x[1]= 6
x[2]= 7

y[0]= 8

y[1]= 3

y[2]= 9
X[0]= -92559604497122534761720676471189149555955165722294310802554880.000000
X[1]= -92559604521067777587750189883038321855178746716337109586673664.000000
X[2]= -92559604545013020413779703294887494154402327710379908370792448.000000
Y[0]= -92559604568958263239809216706736666453625908704422707154911232.000000
Y[1]= -92559604425286806283632136235641632658284422740165914450198528.000000
Y[2]= -92559604580930884652823973412661252603237699201444106546970624.000000

What I have tried:

I have separated that Read_data() function into 2 functions each input 1 array but It still not work out.
If anyone can spot any problem in my code above then I will be very grateful!
Thank you!
Updated 17-May-21 2:16am

1 solution

When I compiled your code I received the following error message:
cp.cpp(13): warning C4477: 'scanf_s' : format string '%3f' requires an argument of type 'float *', but variadic argument 1 has type 'double *'

i changed the format strings and all worked correctly.
Member 14629414 17-May-21 8:22am
@Richard MacCutchan Oh I'm using Visual Studio 2019 community as usual:)) I will follow yours and try to fix it then I will tell you the results! Thank you
Member 14629414 17-May-21 8:25am
@Richard MacCutchan How stupid I'm!!!!!
Richard MacCutchan 17-May-21 8:42am
Don't feel bad, it is an easy mistake.
Member 14629414 17-May-21 8:52am
@Richard MacCutchan I wonder what editor/compiler you're using . My VS 2019 didn't show that errors or I don't know how to search for it?
Richard MacCutchan 17-May-21 9:12am
I am using VS 2019. Make sure that the compiler warning level is set to 3 or above in your project settings. If compiling at the command line use -W3 in the options.
Member 14629414 17-May-21 9:13am
Thank you so much!
Patrice T 17-May-21 8:50am
That is how one learn "Trial and error"
Richard MacCutchan 17-May-21 9:12am
It's certainly how I learn.
Patrice T 17-May-21 9:22am
Me too

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