编辑“︁C 语言错误日志”︁（章节）

=== 简单控制台日志示例 ===
<syntaxhighlight lang="c">
#include <stdio.h>
#include <time.h>
#include <stdarg.h>

void log_message(const char* level, const char* format, ...) {
    time_t now;
    time(&now);
    printf("[%s] %.24s: ", level, ctime(&now));
    
    va_list args;
    va_start(args, format);
    vprintf(format, args);
    va_end(args);
    
    printf("\n");
}

int main() {
    log_message("ERROR", "File not found: %s", "data.txt");
    log_message("INFO", "Program started");
    return 0;
}
</syntaxhighlight>

'''输出示例：'''
<pre>
[ERROR] Mon Jul 15 10:30:45 2024: File not found: data.txt
[INFO] Mon Jul 15 10:30:45 2024: Program started
</pre>