#include <stdio.h>
int main() {
    unsigned long long int num = 285212672; //FYI: fits in 29 bits
    int normalInt = 5;
    printf("My number is %d bytes wide and its value is %ul. A normal number is %d.\n", sizeof(num), num, normalInt);
    return 0;
}

输出:

My number is 8 bytes wide and its value is 285212672l. A normal number is 0.

我假设这个意外的结果来自于输出unsigned long long int。你如何打印()一个unsigned long long int?


当前回答

对于使用MSVS的long long(或__int64),您应该使用%I64d:

__int64 a;
time_t b;
...
fprintf(outFile,"%I64d,%I64d\n",a,b);    //I is capital i

其他回答

使用ll (el-el) long-long修饰符和u (unsigned)转换。(适用于windows, GNU)。

printf("%llu", 285212672);

您可能想尝试使用inttypes.h库,它可以为您提供诸如 Int32_t, int64_t, uint64_t等。 然后你可以使用它的宏,如:

#include <inttypes.h>

uint64_t x;
uint32_t y;

printf("x: %"PRIu64", y: %"PRIu32"\n", x, y);

这“保证”不会给您带来与long、unsigned long等相同的麻烦,因为您不必猜测每种数据类型中有多少位。

非标准的东西总是奇怪的:)

对于长而长的部分 在GNU下是L, ll或q

在窗户下,我相信它只是

使用VS2005将其编译为x64:

%llu运行良好。

一种方法是用VS2008将其编译为x64

这运行如你所料:

int normalInt = 5; 
unsigned long long int num=285212672;
printf(
    "My number is %d bytes wide and its value is %ul. 
    A normal number is %d \n", 
    sizeof(num), 
    num, 
    normalInt);

对于32位代码,我们需要使用正确的__int64格式说明符%I64u。所以它变成了。

int normalInt = 5; 
unsigned __int64 num=285212672;
printf(
    "My number is %d bytes wide and its value is %I64u. 
    A normal number is %d", 
    sizeof(num),
    num, normalInt);

这段代码适用于32位和64位VS编译器。