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{
"metadata": {
"name": "",
"signature": "sha256:95f715496e847b4ccbd328c0da6129f101af5cd4b3c551a2f5644703db14657d"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Hour 23 : Compiling Programs: The C Preprocessor"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 23.1, Page No 394"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"METHOD = \"ABS\"\n",
"def ABS(val):\n",
" if val < 0:\n",
" return -(val)\n",
" else:\n",
" return (val)\n",
"MAX_LEN = 8\n",
"NEGATIVE_NUM = -10\n",
"array = range(MAX_LEN)\n",
"print \"The orignal values in array:\"\n",
"for i in range(MAX_LEN):\n",
" array[i] = (i + 1) * NEGATIVE_NUM;\n",
" print \"array[\",i,\"]:\",array[i]\n",
"print \"\\nApplying the \",METHOD,\" macro:\\n\"\n",
"for i in range(MAX_LEN):\n",
" print \"ABS(%d) : \"%(array[i]), ABS(array[i])"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The orignal values in array:\n",
"array[ 0 ]: -10\n",
"array[ 1 ]: -20\n",
"array[ 2 ]: -30\n",
"array[ 3 ]: -40\n",
"array[ 4 ]: -50\n",
"array[ 5 ]: -60\n",
"array[ 6 ]: -70\n",
"array[ 7 ]: -80\n",
"\n",
"Applying the ABS macro:\n",
"\n",
"ABS(-10) : 10\n",
"ABS(-20) : 20\n",
"ABS(-30) : 30\n",
"ABS(-40) : 40\n",
"ABS(-50) : 50\n",
"ABS(-60) : 60\n",
"ABS(-70) : 70\n",
"ABS(-80) : 80\n"
]
}
],
"prompt_number": 9
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 23.2, Page No 398"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#There is no concept of the mentioned directives in Python.\n",
"UPPER_CASE = True\n",
"LOWER_CASE = False\n",
"if UPPER_CASE:\n",
" print \"THIS LINE IS PRINTED OUT,\\n\"\n",
" print \"BECAUSE UPPER_CASE IS DEFINED.\\n\"\n",
"if not LOWER_CASE:\n",
" print \"\\nThis line is printed out,\\n\"\n",
" print \"because LOWER_CASE is not defined.\\n\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"THIS LINE IS PRINTED OUT,\n",
"\n",
"BECAUSE UPPER_CASE IS DEFINED.\n",
"\n",
"\n",
"This line is printed out,\n",
"\n",
"because LOWER_CASE is not defined.\n",
"\n"
]
}
],
"prompt_number": 13
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 23.3, Page No 401"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"C_LANG = 'C'\n",
"B_LANG = 'B'\n",
"NO_ERROR = 0\n",
"if C_LANG == 'C' and B_LANG == 'B':\n",
" del C_LANG\n",
" C_LANG = \"I only know C language.\\n\"\n",
" print C_LANG\n",
" del B_LANG\n",
" B_LANG = \"I know BASIC.\\n\"\n",
" print C_LANG,B_LANG\n",
"elif C_LANG == 'C':\n",
" del C_LANG\n",
" C_LANG = \"I only know C language.\\n\"\n",
" print C_LANG\n",
"elif B_LANG == 'B':\n",
" del B_LANG\n",
" B_LANG = \"I only know BASIC.\\n\"\n",
" print B_LANG\n",
"else:\n",
" print \"\u201cI don\u2019t know C or BASIC.\\n\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"I only know C language.\n",
"\n",
"I only know C language.\n",
"I know BASIC.\n",
"\n"
]
}
],
"prompt_number": 5
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 23.4, Page No 403"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"ZERO = 0\n",
"ONE = 1\n",
"TWO = ONE + ONE\n",
"THREE = ONE + TWO\n",
"TEST_1 = ONE\n",
"TEST_2 = TWO\n",
"TEST_3 = THREE\n",
"MAX_NUM = THREE\n",
"NO_ERROR = ZERO\n",
"def StrPrint(ptr_s,max1):\n",
" for i in range(max1):\n",
" print \"Content: \",ptr_s[i],\"\\n\"\n",
"\n",
"str1 = [\"The choice of a point of view\",\"is the initial act of culture.\",\"--- by O. Gasset\"]\n",
"if TEST_1 == 1:\n",
" if TEST_2 == 2:\n",
" if TEST_3 == 3:\n",
" StrPrint(str1,MAX_NUM)\n",
" else:\n",
" StrPrint(str1,MAX_NUM - ONE)\n",
" else:\n",
" StrPrint(str1,MAX_NUM - ONE)\n",
"else:\n",
" \"No TEST macro has been set.\\n\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Content: The choice of a point of view \n",
"\n",
"Content: is the initial act of culture. \n",
"\n",
"Content: --- by O. Gasset \n",
"\n"
]
}
],
"prompt_number": 9
}
],
"metadata": {}
}
]
}
|
