在C的中间打印带空字符的char数组

Question

I have noticed that when you try to print a null character in C, nothing will get printed.

printf("trying to print null\n");
printf("%c", '\0');

However, I am trying to print the characters in the following array one by one, up to the sixth character which is the null character.

char s[] = "Hello\0Bye";
int i;
for(i = 0; i < 7; i++) {
    printf("%c", s[i]);
}
printf("\n");

I was expecting "Hello" to be printed, as since the sixth character is null nothing will be printed. However my output was: "HelloB". It seems like printf skipped the null character and just went to the next character. I am not sure why the output is "HelloB" instead of "Hello".

Any insights would be really appreciated.

Answer 1

The construction '\\0' is commonly used to represent the null character. Here

printf("%c", '\0');

it prints nothing.

And in the decalaration of s

char s[] = "Hello\0Bye"; 

when you print like

for(i = 0; i < 7; i++) {
    printf("%c", s[i]); 
}

printf() prints upto 0<7(h) , 1<7(e) .. 5<7(nothing on console) , 6<7(B) iterations only and 6th charactar is B hence its prints HelloB .

I was expecting "Hello" to be printed ? For that you should rotate loop until \\0 encountered. For eg

for(i = 0; s[i] != '\0'; i++) { /* rotate upto \0 not 7 or random no of times */ 
   printf("%c", s[i]); 
}

Or even you no need to check s[i] != '\\0'

for(i = 0; s[i]; i++) { /* loop terminates automatically when \0 encounters */ 
     printf("%c", s[i]); 
}

Answer 2

You can use below two options
1. size_t fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream);
2.Iterate through each character and print it.

Answer 3

int i; for(i=0; i<7; i++) int i; for(i=0; i<7; i++) generates 7, not 6 iterations. Printing \\0 generates no pixels on the console (character 6) and then the 7th character ( B follows).