C program for keyword searching

This tutorial provides a brief information on all 32 keywords in C programming. Variables declared within function bodies are automatic by default. They are recreated each time a function is executed. Since automatic variables are local to a function, they are also called local variables. To learn more visit C storage class.

The break statement terminates the innermost loop immediately when it's encountered. It's also used to terminate the switch statement. When i is equal to 3, the continue statement comes into effect and skips 3.

When i is equal to 7, the break statement comes into effect and terminates the for loop. To learn more, visit C break and continue statement. The switch and case statement is used when a block of statements has to be executed among many blocks.

For example:. Visit C switch statement to learn more. To learn more, visit C data types. To learn more, visit C variables and constants. To learn more, visit C do Here, number is a single-precision floating type variable whereas, longNumber is a double-precision floating type variable.

To learn more, visit C if Here, an enumerated variable suit is created having tags: hearts , spades , clubs, and diamonds. The extern keyword declares that a variable or a function has external linkage outside of the file it is declared. To learn more, visit C storage type. There are three types of loops in C programming. First, it checks the condition, if condition matches, statements the following while will be executed.

Working of do is the same, the only difference does first execute the statement and then check the condition, on the other hand, the whole first check condition then executes the statements. It is a loop control statement that executes the loop until the given condition matches. Based on the condition, it breaks the loop.

A keyword break can also be used with a switch statement to break the loop. It is exactly the opposite of the break statement. Continue Statement will continue the execution of the loop, it only skips the line where it is mentioned.

In the program given below, we create two labels even and odd to transfer the flow of control. A variable that is declared as const remains constant.

The value of the constant variable cannot be changed. In the first program, you can see that the value of i has been changed. In the second program when we are going to change the value of constant, be it throws the error.

It declares the all the variables in one group be following the struct keyword. After that creating an object of the struct, all the variables are retrieved. For example, char spelling; So here, spelling is a character type variable. So we have to make sure that our Usage function can accept this parameter. In this case a char pointer.

The rest of the Usage function are just some simple print statements. So our function needs to except to parameters, in this case some char pointers. What we say in the if statement is: open a file read-only and parse the result to our file-pointer. If the result is no good, return Next the while loop where most of the work is done. With fgets we get the content of the file, line by line. In the if statement we use the strstr function to search for our string in the content we fetched from the file.

The while loop will continue until we reach the end of the file. And there you have it, a complete source code example to search for a string in a file. Just download the source code for this tutorial. We have included a sample text file to search in. Okay, so that is all well and good, but: If there is more than one occurrence on the same line, i.

Any ideas on a solution for that? Is there any way to update the file data in C language eg.