strange error msg

This is a discussion on strange error msg within the C Programming forums, part of the General Programming Boards category; Hello world!! I was trying to make a function that replaces some given string with another given string throughout a ...

  1. #1
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    Mar 2011
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    strange error msg

    Hello world!!

    I was trying to make a function that replaces some given string with another given string throughout a give string.

    but a strange error showed up. When I tried small pieces of code the error appeared again with on trying to execute the following code:
    Code:
    void f(char * ptr)
    {
    	*(ptr) = 'a';
    }
    
    int main(void)
    {
    	char * strng = "Hello world. The world is just awesome";
    	puts(strng);
    	f(strng);
    }
    error appears when trying to execute *(ptr) = 'a';

    error msg:
    Code:
    Unhandled exception at 0x011c17a1 in replacing string 2.0.exe: 0xC0000005: Access violation writing location 0x011c5d30.
    Thanks in advance.

  2. #2
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    Aug 2010
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    Ontario Canada
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    That's because you're trying to change a string literal. No decent compiler will let you do that.

    Code:
    char *string = strdup("! Hello World"); // write to an actual string
    
    *string ='X';
    
    printf("%s",string);
    
    free(string); // because strdup uses malloc()

  3. #3
    Programming Wraith GReaper's Avatar
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    Or you can define it this way:
    Code:
    char string[ ] = "Hello World!";
    Devoted my life to programming...

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