case 6:
scanf("%d",&num_rot);
rot1=(pixel**)malloc(width*sizeof(pixel));
for(i=0;i<width;i++)
rot1[i]=(pixel*)malloc(height*sizeof(pixel));

rot2=(pixel**)malloc(height*sizeof(pixel));
for(i=0;i<height;i++)
rot2[i]=(pixel*)malloc(width*sizeof(pixel));

rot3=(pixel**)malloc(width*sizeof(pixel));
for(i=0;i<width;i++)
rot3[i]=(pixel*)malloc(height*sizeof(pixel));

if(num_rot==1)
{for i=0;i<width;i++)
for(j=0;j<height;j++)
{rot1[i][j].r=matrice[height-1-j][i].r;
rot1[i][j].g=matrice[height-1-j][i].g;
rot1[i][j].b=matrice[height-1-j][i].b;
}

for(i=0;i<width;i++)
for(j=0;j<height;j++)
{matrice[i][j].r=rot1[i][j].r;
matrice[i][j].g=rot1[i][j].g;
matrice[i][j].b=rot1[i][j].b;
}
}

else if (num_rot==2)
{for i=0;i<width;i++)
for(j=0;j<height;j++)
{rot1[i][j].r=matrice[height-1-j][i].r;
rot1[i][j].g=matrice[height-1-j][i].g;
rot1[i][j].b=matrice[height-1-j][i].b;
}

for(i=0;i<height;i++)
for(j=0;j<width;j++)
{rot2[i][j].r=rot1[height-1-j][i].r;
rot2[i][j].g=rot1[height-1-j][i].g;
rot2[i][j].b=rot1[height-1-j][i].b;
}

for(i=0;i<height;i++)
for(j=0;j<width;j++)
{matrice[i][j].r=rot2[i][j].r;
matrice[i][j].g=rot2[i][j].g;
matrice[i][j].b=rot2[i][j].b;
}
}

else if(num_rot==3)
{for i=0;i<width;i++)
for(j=0;j<height;j++)
{rot1[i][j].r=matrice[height-1-j][i].r;
rot1[i][j].g=matrice[height-1-j][i].g;
rot1[i][j].b=matrice[height-1-j][i].b;
}

for(i=0;i<height;i++)
for(j=0;j<width;j++)
{rot2[i][j].r=rot1[height-1-j][i].r;
rot2[i][j].g=rot1[height-1-j][i].g;
rot2[i][j].b=rot1[height-1-j][i].b;
}

for(i=0;i<width;i++)
for(j=0;j<height;j++)
{rot3[i][j].r=rot2[height-1-j][i].r;
rot3[i][j].g=rot2[height-1-j][i].g;
rot3[i][j].b=rot2[height-1-j][i].b;
}

for(i=0;i<width;i++)
for(j=0;j<height;j++)
{matrice[i][j].r=rot3[i][j].r;
matrice[i][j].g=rot3[i][j].g;
matrice[i][j].b=rot3[i][j].b;
}
}