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#include <stdio.h>
int main() {
// declaring a string variable
char str[] = "Hello, world!";
// printing the string
printf("%s\n", str);
// accessing individual characters in the string
printf("First character: %c\n", str[0]);
printf("Third character: %c\n", str[2]);
// changing a character in the string
str[7] = 'D';
// printing the modified string
printf("Modified string: %s\n", str);
return 0;
}