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Segmentation error while trying to change row

This code gives me a segmentation error at runtime.

char *str = "HELLO";
str[0] = str[2];

Please tell me why?

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4 answers

The standard does not allow changing a string literal. The string is stored in the readonly segment of the program, for example, on Linux, it is stored in the .rodataexecutable file section , which cannot be written.

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You cannot change the contents of a string literal. Put it in an array of characters if you want to do this.

char str[] = "HELLO";
str[0] = str[2];
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seg, "HELLO" - , , .

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This compiles to a string literal in a read-only section.

        .section        .rodata
.LC0:
        .string "HELLO"
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