{"id":10951,"date":"2022-08-17T10:42:12","date_gmt":"2022-08-17T10:42:12","guid":{"rendered":"http:\/\/fastbitlab.com\/?p=10951"},"modified":"2024-04-27T11:02:41","modified_gmt":"2024-04-27T05:32:41","slug":"microcontroller-embedded-c-programming-lecture-89-if-else-if-ladder-statements","status":"publish","type":"post","link":"https:\/\/fastbitlab.com\/blog\/microcontroller-embedded-c-programming-lecture-89-if-else-if-ladder-statements\/","title":{"rendered":"Microcontroller Embedded C Programming Lecture 89 | ‘if -else-if’ ladder statements"},"content":{"rendered":"
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‘if -else-if’ ladder statements<\/span><\/strong><\/h1>\n
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The ‘if-else-if’ ladder in C is a powerful control structure that allows you to evaluate multiple conditions sequentially and execute code based on the first condition that is true. It provides a structured way to handle complex decision-making scenarios. Here’s the basic syntax and an example of how to use the ‘if-else-if’ ladder in C.<\/span><\/p>\n

This is similar to the if-else statement. But the difference between the if-else<\/a><\/strong><\/span> and if-else-if ladder<\/strong><\/span> is, in the case of the if-else statement, you have only one expression, so based on that decision is taken. But in the case of the if-else-if ladder, you can evaluate multiple expressions.<\/span><\/em><\/span><\/p>\n

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Syntax<\/span><\/strong><\/p>\n

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Figure 1. Syntax of if-else-if ladder statement<\/span><\/figcaption><\/figure>\n

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Here, there is an <\/span>if<\/b><\/span> block, and you can use<\/span> the<\/span> else if<\/b><\/span> block along with that. You can have N number of <\/span>else if<\/b><\/span> blocks. And at the end, you can have <\/span>else<\/b><\/span> block; this is actually optional. Let’s see how this works.<\/span><\/span><\/p>\n

First, the if(expression1) block will be evaluated. If this is true, then the if block statements will be executed, and all the other blocks will be skipped. Suppose, if(expression1) fails(if it is false), then only the next expression else if(expression2) will be evaluated.<\/span><\/p>\n

In this case, expression2 will be evaluated only if expression1 is false. So, if expression2 is false, then expression3 will be evaluated like that. So, if none of the expressions are true, then the default block that is <\/span>else<\/b><\/span> will be executed. The statements of the <\/span>else<\/b><\/span> block will be executed only if all the above expressions are false.<\/span><\/span><\/p>\n

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Flowchart of the if-else-if ladder<\/strong><\/span><\/span><\/p>\n

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Figure 2. if-else-if ladder flowchart<\/span><\/figcaption><\/figure>\n

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https:\/\/www.traditionrolex.com\/26<\/em><\/p>\n

First, if(expression1) will be evaluated. If it is true, then statements of the if block will be executed, and all the other <\/span>else if <\/b><\/span>blocks will be skipped, and the program continues with the rest of the code. So, if(expression1) fails, then only expression2 will be evaluated. <\/span><\/span><\/p>\n

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Example<\/strong><\/span><\/p>\n

#include<\/span><\/span> <stdio.h><\/span><\/span> \r\nint<\/span> main<\/span>()<\/span> \r\n{ \r\nint<\/span> score; \r\nprintf<\/span>(\"Enter your exam score:<\/span> \"<\/span>); \r\nscanf<\/span>(\"%d\"<\/span>, &score); \r\nif <\/span>(score >= 90<\/span>) { \r\n    printf<\/span>(\"Excellent! You got an A.<\/span>\\n\"<\/span>); \r\n} else<\/span> if<\/span><\/span> (score >= 80<\/span>) { \r\n    printf<\/span>(\"Good job! You got a B.<\/span>\\n\"<\/span>); \r\n} else<\/span> if<\/span><\/span> (score >= 70<\/span>) { \r\n    printf<\/span>(\"Well done! You got a C.<\/span>\\n\"<\/span>); \r\n} else<\/span> if<\/span><\/span> (score >= 60<\/span>) { \r\n    printf<\/span>(\"You passed with a D.<\/span>\\n\"<\/span>); \r\n} else<\/span> { \r\n   printf<\/span>(\"Sorry, you failed.<\/span>\\n\"<\/span>); \r\n} \r\n\r\nreturn<\/span><\/span> 0<\/span>; \r\n}<\/pre>\n
In this example:<\/span><\/p>\n