请问大家为什么加12和不加有区别呢？如果不加12显示出来的这个1703808是指什么呢？有人知道吗？

给代码看看

#include <stdio.h>

int main(int argc, char const *argv[])
{
        char * zifuchuan = "
        int shuzi;
        char zuhe[50];
        memset(zuhe,0,50);

        sscanf(zifuchuan,"%s=%d",zuhe,&shuzi);

        printf("%d\n", shuzi);

        


        return 0;
}

我将楼主在3楼的代码整理了一下，再现了他真实的意图

#include <stdio.h>

int main( void )
{
    const char* s = "";

    char a1[50];
    int b1;
    int n1 = sscanf( s, "%12s=%d", a1, &b1 );
    printf( "读入%d个值\na = %s\nb = %d\n\n", n1, a1, b1 );

    char a2[50];
    int b2;
    int n2 = sscanf( s, "%s=%d", a2, &b2 );
    printf( "读入%d个值\na = %s\nb = %d\n\n", n2, a2, b2 );

    return 0;
} 

输出
读入2个值
a =
b = 2019

读入1个值
a =
b = -858993460