Roux: Created page with " Handling arrays and pointers. The syntax uses the c99 standard. To compile, use :> gcc -std=c99 main.c #include void f(int * p,int L) { for(i..."

2012-11-13T15:06:45Z

Created page with " Handling arrays and pointers. The syntax uses the c99 standard. To compile, use :> gcc -std=c99 main.c <source lang='c'> #include <stdio.h> void f(int * p,int L) { for(i..."

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Handling arrays and pointers. The syntax uses the c99 standard. To compile, use
:> gcc -std=c99 main.c

<source lang='c'>
#include <stdio.h>

void f(int * p,int L)
{
for(int i=0;i<L;i++)
*(p+i) = 3;
}

void g(double * p,int L)
{
for(int i=0;i<L;i++)
for(int j=0;j<L;j++)
*(p+i*L+j) = 2.0*i+j;
}

void h(double * p,int L)
{
for(int i=0;i<L;i++)
for(int j=0;j<L;j++)
for(int k=0;k<L;k++)
*(p+(i*L+j)*L+k) = i+j+k;
}

int main()
{
int L=3;

// one-dimensional array

int tab[L];
f(&tab[0],L);
for(int i=0; i<L;i++)
printf("%d ",tab[i]);
printf("\n");
printf("\n");

// two-dimensional array

double mat[L][L];
g(&mat[0][0],L);
for(int i=0; i<L;i++)
for(int j=0; j<L;j++)
printf("%d %d %lf\n",i,j,mat[i][j]);
printf("\n");

// three-dimensional array

double tensor[L][L][L];
h(&tensor[0][0][0],L);
for(int i=0; i<L;i++)
for(int j=0; j<L;j++)
for(int k=0; k<L;k++)
printf("%d %d %d %lf\n",i,j,k,tensor[i][j][k]);

return 0;
}
</source>

Pointers and multidimensional arrays - Revision history

Roux: Created page with " Handling arrays and pointers. The syntax uses the c99 standard. To compile, use :> gcc -std=c99 main.c #include void f(int * p,int L) { for(i..."