关于C#：sscanf在以字符n或i开头的字符串中搜索float时返回1

sscanf returns 1 when searching for float in a string starting with the character n or i

在下面的代码中，我希望sscanf返回0，但它返回1并将0.000000分配给float变量x。当字符串以字母i开头但没有其他字母时，会发生相同的行为。

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void main() {
int ss_return;
float x;
char str_to_sscanf[] ="noduh";

ss_return = sscanf( str_to_sscanf,"%f", &x );

printf("

The word passed to sscanf is %s", str_to_sscanf );
printf("

When looking for a float, sscanf returned %d", ss_return );
printf("

and assigned %f to x (declared as float)", x );
printf("

WHY DID sscanf NOT RETURN ZERO????" );
}

该程序的输出为："两个看起来很奇怪的字符"

我想念什么？