1.printf
- double
double dbValue = 56789.1234;
printf("dbValue = %.2f\n", dbValue);
- INT64/UINT64
typedef signed __int64 INT64;
typedef unsigned __int64 UINT64;
INT64 nTimestamp = 1234567890123;
printf("nTimestamp = %I64d\n", nTimestamp);
UINT64 unTimestamp = 12345678901234567;
printf("unTimestamp = %I64u\n", unTimestamp);
运行结果
2. fprintf
- 写文件
FILE *fp = fopen(".\\audioTimestamp.txt", "at");
double dbTimestamp = 12345.67;
fprintf(fp, "%.2f\n", dbTimestamp);
fflush(fp);
fclose(fp);
fopen 的参数:
'a': 以附加的方式打开只写文件。
若文件不存在，则会建立该文件.
如果文件存在，写入的数据会被加到文件尾，即文件原先的内容会被保留.
'at' : 追加打开一个文本文件，并在文件末尾写数据
3.sprintf
int nYear = 2016;
char szBuffer[128] = "Hello World!";
char szMessageBuffer[1024] = {0};
sprintf(szMessageBuffer, "%s Welcome to the year %d\n", szBuffer, nYear);
cout<<szMessageBuffer;
sprintf运行结果
4. swprintf_s
swprintf_s returns the number of wide characters stored in buffer, not counting the terminating null wide character.
wchar_t wszBuffer[1024] = {0};
int nLen = swprintf_s(wszBuffer, 1024, L"%s", "北京110");
wprintf(L"Buffer:%S; length:%d", wszBuffer, nLen);
swprintf_s运行结果
