{
"metadata": {
"name": "",
"signature": "sha256:d4eeb6d301f04950d37e1192961f4665d398ce20c6e4b34ea5228762dfddaffa"
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"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Hour 17: Allocating Memory"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 17.1, Page No 281"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# There is no concept of pointer and dynamic memory allocation in pyton so i have done in this manner\n",
"def StrCopy(str1,str2):\n",
" str1=list(str1)\n",
" str2=list(str2)\n",
" for i in range(len(str1)):\n",
" str2[i]=str1[i]\n",
" str2[i]='\\0'\n",
"\n",
"str1=\"Use malloc() to allocate memory\"\n",
"ptr_str=str\n",
"ptr_str= str1\n",
"\n",
"if(ptr_str!= None):\n",
" StrCopy(str1,ptr_str)\n",
" print \"The string pointed to by ptr_str is : %s\" % ptr_str\n",
"else:\n",
" print \"malloc() function failed.\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The string pointed to by ptr_str is : Use malloc() to allocate memory\n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 17.2, Page No 283"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# There is no concept of pointer and dynamic memory allocation in pyton so i have done in this manner\n",
"def DataMultiply(max1,ptr_int):\n",
" for i in range(max1):\n",
" for j in range(max1):\n",
" ptr_int=(i+1)*(j+1)\n",
" return ptr_int\n",
"def TablePrint(max1,ptr_int):\n",
" print \"The Multiplication table of %d is:\" % max1\n",
" print \"\"\n",
" for i in range(max1):\n",
" print \"%4d\" % (i+1),\n",
" print \"\"\n",
" for i in range(max1):\n",
" print \"----\",\n",
" print\"\"\n",
" for i in range(max1):\n",
" print \"%d|\" % (i+1),\n",
" for j in range(max1):\n",
" print \"%3d\" % ptr_int,\n",
" print\"\"\n",
"\n",
"ptr_int=int\n",
"ptr_int=0\n",
"key='c'\n",
"max1=0\n",
"termination=0\n",
"while(key != 'x'):\n",
" max1=int(raw_input(\"Enter a single digit number: \"))\n",
" if(ptr_int != None):\n",
" print ptr_int\n",
" ptr_int=DataMultiply(max1,ptr_int)\n",
" print ptr_int\n",
" TablePrint(max1,ptr_int)\n",
" else:\n",
" print \"Malloc() function failed.\"\n",
" termination=1\n",
" key='x'\n",
" key=raw_input(\"\\n\\nPress x key to quit; other key to continue.\")\n",
"print\"\\nBYE\\n\"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter a single digit number: 3\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"0\n",
"3\n",
"The Multiplication table of 3 is:\n",
"\n",
" 1 2 3 \n",
"---- ---- ---- \n",
"1| 3 3 3 \n",
"2| 3 3 3 \n",
"3| 3 3 3 \n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"\n",
"Press x key to quit; other key to continue.x\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"BYE\n",
"\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 17.3, Page No 287"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# There is no concept of pointer and dynamic memory allocation in pyton so i have done in this manner\n",
"ptr1=float\n",
"ptr2=float\n",
"ptr1=0.0\n",
"ptr2=0.0\n",
"termination=1\n",
"n=5\n",
"\n",
"if(ptr1 == None):\n",
" print \"Malloc() failed.\"\n",
"elif(ptr2 == None):\n",
" print \"Calloc() failed.\"\n",
"else:\n",
" for i in range(n):\n",
" print \"ptr1[%d]= %5.2f, ptr2[%d]= %5.2f\" %(i,(ptr1+i),i,(ptr2+i))\n",
" termination=0"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"ptr1[0]= 0.00, ptr2[0]= 0.00\n",
"ptr1[1]= 1.00, ptr2[1]= 1.00\n",
"ptr1[2]= 2.00, ptr2[2]= 2.00\n",
"ptr1[3]= 3.00, ptr2[3]= 3.00\n",
"ptr1[4]= 4.00, ptr2[4]= 4.00\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 17.4, Page No 289"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# There is no concept of pointer and dynamic memory allocation in pyton so i have done in this manner\n",
"def StrCopy(str1,str2):\n",
" str1=list(str1)\n",
" str2=list(str1)\n",
" for i in range(len(str1)-1):\n",
" str2[i]=str1[i]\n",
" str2[i]='\\0'\n",
" return str2\n",
"\n",
"str1=[\"There's music in the sighing of a reed;\",\"There's music in the gushing of a rill;\",\"There's music in all things if men had ears;\",\"There earth is but an echo of the spheres.\\n\"]\n",
"termination=0\n",
"if(ptr == None):\n",
" print \"Malloc() failed.\"\n",
" termination=1\n",
"else:\n",
" ptr1=StrCopy(str1[0],ptr)\n",
" print \"\".join(ptr1)\n",
" for i in range(1,4):\n",
" if (ptr == None):\n",
" print \"realloc() failed.\"\n",
" termination=1\n",
" i=4\n",
" else:\n",
" ptr1=StrCopy(str1[i],ptr)\n",
" print \"\".join(ptr1)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"There's music in the sighing of a ree\u0000;\n",
"There's music in the gushing of a ril\u0000;\n",
"There's music in all things if men had ear\u0000;\n",
"There earth is but an echo of the spheres\u0000\n",
"\n"
]
}
],
"prompt_number": 12
}
],
"metadata": {}
}
]
}