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#include <stdio.h>
int main() {
printf("Hello, world! This is a log message.\n");
return 0;
}
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#include <stdio.h>
#include <math.h>
int main()
{
double num = 5.6, result;
result = log(num);
printf("log(%.1f) = %.2f", num, result);
return 0;
}