Sure! Here's a simple "Hello, world!" program in C:

#include <stdio.h>

int main() {
  printf("Hello, world!\n");
  return 0;
}

This program uses the printf function from the stdio.h library to print the message "Hello, world!" to the console. The \n character at the end of the string adds a newline to the output, so the prompt will start on a new line after the message is displayed. Finally, the return 0; statement at the end of the main function is used to indicate that the program has completed successfully.
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