View Full Version : init problem

Vlasko

02-15-2002, 12:35 AM

i have a problem with initialization i have a array of points[9][2] i'm doing initialization on the x axis like this

for(i=0;i<10;i++)

for(j=0;j<=2;j++)

point[i][j].x=-1+((2/3)*j);

the results are:

for j=0 point[i][0].x=-1 correct

for j=1 point[i][1].x=-1 not correct !!!

for j=2 point[i][2].x=-0.333333 again not correct except for point[9][2].x which is correct (0.33333) where is the problem ?

Use 2.0/3.0 instead of 2/3. Without '.0', you get integer division.

Vlasko

02-16-2002, 12:04 AM

Done that but still it isn't working

Vlasko

02-17-2002, 05:16 AM

ok i have done some debugging and it seems that the problem is only with the last row (i mean point[i][2]) which is -1.0f when it should be 0.03333f

for(i=0to9)

for(j=0to2)

{

point[i][j].x=.....

*

}

~

when i added printf at * point everything was OK but at ~ point it has shown incorrect values(-1 it should be 0.33333) except for that point[9][2] which is ok can someone help me with that

When I run the following code, it gives the correct results. You should check your code for typing mistakes. For example, I have a tendency to swap i's and j's.

struct Point

{

double x, y;

};

Point point[10][3];

int i, j;

// init

for(i=0;i<10;i++)

{

for(j=0;j<=2;j++)

point[i][j].x=-1+((2.0/3.0)*j);

}

// print

for(i=0;i<10;i++)

{

for(j=0;j<=2;j++)

printf("point[%d][%d].x=%f\n", i, j,

point[i][j].x);

}

Michalek366

02-18-2002, 02:55 AM

for (j=0;j<2;j++)

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