{"id":13909,"date":"2023-02-10T14:20:14","date_gmt":"2023-02-10T08:50:14","guid":{"rendered":"https:\/\/fastbitlab.com\/?p=13909"},"modified":"2023-08-07T14:24:56","modified_gmt":"2023-08-07T08:54:56","slug":"microcontroller-embedded-c-programming-lecture-176-string-literal","status":"publish","type":"post","link":"https:\/\/fastbitlab.com\/blog\/microcontroller-embedded-c-programming-lecture-176-string-literal\/","title":{"rendered":"Microcontroller Embedded C Programming Lecture 176| String literal"},"content":{"rendered":"
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 <\/p>\n<\/div>\n

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String literal<\/span><\/strong><\/h1>\n
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 <\/p>\n<\/div>\n<\/div>\n<\/div>\n

String literal or String constant<\/strong><\/span><\/p>\n

A string literal is a sequence of characters enclosed within double quotes (“) or single quotes (‘). It is a data type in computer programming that represents a sequence of characters, such as text.<\/span><\/p>\n

String literals are used to represent strings of characters in a program. They are stored in the program’s memory as a sequence of characters terminated by a null character ‘\\0’ (ASCII value 0).<\/span><\/p>\n

It is important to note that string literals are read-only and attempting to modify them can result in undefined behavior. To create a mutable string in C, you should use a character array instead of a string literal.<\/span><\/p>\n

 <\/p>\n

Let’s say, I store the string in my program in this fashion.<\/span><\/p>\n

char *msg1 = \u201cHello\u201d;<\/b><\/span><\/p>\n

This is also a valid method to store a string in your program. So, in this method, we have used a character pointer. <\/span><\/p>\n

Here on the left-hand side is nothing but a char pointer. So,  msg1 is a pointer variable of type char *. And you know that pointer variables are used to store the pointer or an address. <\/span><\/p>\n

\u201cHello\u201d must be converted into a pointer. So, at the end of the day, msg1 will hold a pointer.<\/span><\/p>\n

Who allocated the memory for \u201cHello\u201d this string or for this message?<\/strong><\/span><\/p>\n

The answer to that is the compiler. <\/span><\/p>\n

The compiler allocates some address to this string literal and then the compiler stores the base address of that message into the character pointer here, that is msg1.<\/span><\/p>\n

 <\/p>\n

char *msg1 = \u201cHello\u201d;<\/b><\/span><\/p>\n

char msg2[] = \u201cHello\u201d; <\/b><\/span><\/p>\n

What is the difference between these two statements?<\/span><\/strong><\/p>\n

Both are valid ‘C’ definitions. <\/span><\/p>\n

char *msg1 = \u201cHello\u201d;<\/b><\/span><\/p>\n

In the first statement, the compiler allocates some memory for this string literal and that memory lives in the read-only memory or ROM. So, this string “Hello” actually lives in ROM. <\/span><\/p>\n

char msg2[] = \u201cHello\u201d; <\/b><\/span><\/p>\n

But in the second statement, you have created a character array. And you have stored the characters. In this case, this string actually lives in RAM. That means, in this case, I can modify the contents of the string because it lives in RAM. <\/span><\/p>\n

 <\/p>\n

Let\u2019s say I can do msg2[0] = ‘S<\/span>‘<\/strong> here. A string will be modified. <\/span><\/p>\n

But I cannot do the same thing in the first case. I cannot do msg1[0] = ‘S’;<\/span><\/strong> \/\/ This is wrong.<\/span><\/span><\/p>\n

Why? <\/span><\/p>\n

Because you are trying to modify the value which is living in a ROM memory. So, that doesn’t make any sense.<\/span><\/p>\n

 <\/p>\n

Let’s investigate this practically by writing a program.<\/span><\/p>\n

Let’s write a small program to understand a string variable and a string literal or a string constant. <\/span><\/p>\n

#include<\/span><stdio.h>\r\n\r\nint<\/span> main(void<\/span>)\r\n\r\n{\r\n    char<\/span> msg1[] = \"Hello how are you?\";\r\n    printf<\/span>(\"Message is : %s\\n\",msg1);\r\n\r\n    for<\/span>(;;);\r\n\r\n}<\/pre>\n
<\/div>\n
First store a string in my program. So, now let me create a char array. Let me call msg1 = “Hello<\/strong> how are you?”;<\/strong><\/span><\/span><\/p>\n
And after that, let me print this message. <\/span><\/p>\n
printf(\u201cMessage is : %s\\n\u201d, msg1);<\/span> <\/span><\/strong><\/p>\n
To print a string you should use a format specifier \u2018%s<\/span><\/strong>\u2019. And then just mention the string variable that is msg1. That’s it. <\/span><\/p>\n
You see in the SWV ITM Data Console the message is printed.<\/span><\/p>\n
\"Figure
Figure 1. Code<\/span><\/figcaption><\/figure>\n
Now let’s analyze this variable. <\/span><\/p>\n
Now let’s see where exactly this variable is stored in the memory. For that, let’s take the help of a memory browser, but before that let’s check the variable window. Here you can see that the characters are stored in this array.  And the base address is 0x2001ffdc, so that’s actually a RAM location. That proves that our array is stored in RAM. <\/span><\/p>\n
Let’s go to the memory browser and type the base address 0x2001ffdc and here it shows that data, as shown in Figure 2. <\/span><\/p>\n
\"String
Figure 2. Output<\/span><\/figcaption><\/figure>\n
 <\/p>\n
FastBit Embedded Brain Academy Courses<\/b><\/span><\/p>\n
Click here:<\/span> <\/span><\/span><\/span>https:\/\/fastbitlab.com\/course1<\/span><\/a><\/span><\/p>\n
 <\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
  String literal   String literal or String constant A string literal is a sequence of characters enclosed within double quotes (“) or single quotes (‘). It is a data type in computer programming that represents a sequence of characters, such as text. String literals are used to represent strings of characters in a program. 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