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18538954
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2013-08-30T18:04:17.140
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For, <blockquote> <blockquote> char a[]="June 14"; </blockquote> </blockquote> gcc on Linux allocates memory in the stack area. Following transformations happens, <blockquote> <blockquote> <ol> <li>allocate memory for a in stack for size of ("June 14") + 1 </li> <li>Then copies the "June 14" into the memory area when we call the function</li> </ol> </blockquote> </blockquote> For, <blockquote> <blockquote> char *b="June 14"; </blockquote> </blockquote> gcc on Linux allocates the memory in the .rodata and stores the "June 14" string in the .rodata section. Then variable b is allocated and it holds the address of the memory area of "June 14" string which is in the .rodata section. Look at the sample C program for the same, <pre><code> #include<stdio.h> main() { char a[]="Test Message"; //memory is allocated in the stack and stores "Test Message" char *b="Test Const String"; //Memory allocated in .rodata section and b points to the memory address } </code></pre> I have compiled the above code with gcc with -c options and analyzed the obj file using objdump command. Following is the output, constPointer.o: file format elf32-i386 <pre><code> Contents of section .text: 0000 8d4c2404 83e4f0ff 71fc5589 e55183ec .L$.....q.U..Q.. **0010 24c745eb 54657374 c745ef20 4d6573c7 $.E.Test.E. Mes. 0020 45f37361 6765c645 f700c745 f8000000 E.sage.E...E....** 0030 0083c424 595d8d61 fcc3 ...$Y].a.. Contents of section .rodata: **0000 54657374 20436f6e 73742053 7472696e Test Const Strin 0010 6700 g.** Contents of section .comment: 0000 00474343 3a202847 4e552920 342e332e .GCC: (GNU) 4.3. 0010 30203230 30383034 32382028 52656420 0 20080428 (Red 0020 48617420 342e332e 302d3829 00 Hat 4.3.0-8). </code></pre> I have highlighted(using **) memory allocation done in the different section. In that "Test const String" is placed in the .rodata section which is not modifiable. So, a[3]='t'; will compile without any error or warning, but b[2]='t'; will result in run time error. Hope this helps. 
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1. POcomparison of array and pointer version in terms of memory allocation
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1. USSaravanan
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