2024-11-03 20:03:05 +00:00
> 1. The following function calls supposedly write a single new-line character, but some are incorrect. Identify which calls don't work and explain why.
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b. `printf("%c", "\n");` - This is invalid because the double quotes make `\n` a string, but it's being displayed with the `%c` formatting specifier.
c. `printf(%s, '\n');` - This is invalid because it's trying to display a `char` using the string formatting specifier.
2024-11-03 21:10:04 +00:00
e. `printf('\n');` - `printf` 's first argument should be a string, not a `char` .
h. `putchar("\n");` - `putchar` 's first argument should be a `char` , not a string.
i. `puts('\n');` - `puts` 's first argument should be a string, not a `char` .
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j. `puts("\n");` - `puts` will write a newline after writing a string, so this will write two newlines.
> 2. Suppose that `p` has been declared as follows:
```c
char *p = "abc";
```
> Which of the following function calls are legal? Show the output produced by each legal call, and explain why all the others are illegal.
```c
// A - Not legal, because putchar accepts a `char` , not a pointer.
putchar(p);
// B - Legal, output: `a`
```
