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BTech Tuition > Learn BTech Tuition > How to use recursive function in C?
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How to use recursive function in C?

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Recursion is the process of repeating items in a self-similar way. In programming languages, if a program allows you to call a function inside the same function, then it is called a recursive call of the function. But one condition is there, that program must have ending condition to call, other wise...
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Recursion is the process of repeating items in a self-similar way. In programming languages, if a program allows you to call a function inside the same function, then it is called a recursive call of the function. But one condition is there, that program must have ending condition to call, other wise system will crash. quick example of factorial: int factorial(unsigned int i) { if(i <= 1) { return 1; } return i * factorial(i - 1); } int main() { int i = 4; printf("Factorial of %d is %d\n", i, factorial(i)); return 0; } It will produce result 24. read less
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Recursive functions are those functions who call itself. For example: #include "stdio.h" int main(void) { printf("%d",factorial(5)); return 0; } int factorial(int number){ if(number == 1 || number == 0) return 1; else return number * factorial(number-1); } now in above program can also be written...
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Recursive functions are those functions who call itself. For example: #include "stdio.h" int main(void) { printf("%d",factorial(5)); return 0; } int factorial(int number){ if(number == 1 || number == 0) return 1; else return number * factorial(number-1); } now in above program can also be written using while or for loop but WHILE = IF-ELSE in recursion. There must be compulsory at least one terminating condition or base condition. Tracing of above program: F(5) 1) checks if the condition is that passed number is 1 or 0. 2) if condition fails it goes to else block and return number * fact(number-1) in this case return 5 * fact(4); return 4 * fact(3); return 3 * fact(2); return 2 * fact(1); now the number = 1 and as soon as if condition get true it will return value 1; return 2 * 1; return 3 * (return 2 * 1 - returned value); and like wise. read less
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Function which calls itself like factorial of a number.
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Recursive function means a function which call itself and should have at least one exist condition. Without exit condition this type of function call goes infinitely which will leads to application hang-up OR in deadlock state. Recursive function uses STACK data structure i.e. LIFO Concept (Last-in First...
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Recursive function means a function which call itself and should have at least one exist condition. Without exit condition this type of function call goes infinitely which will leads to application hang-up OR in deadlock state. Recursive function uses STACK data structure i.e. LIFO Concept (Last-in First out). For Ex - To evaluate factorial value using Recursion main() { int num; printf("Enter a number to evaluate its factorial : "); scanf("%d", &num); printf("Factorial is : %d", fact(num)); // Calling fact function to calculate factorial of a number } int fact(int num) { if(num >) { return (num * fact(num - 1)); // Calling itself } else { //Exit Condition from Recursive function return 1; } } Let's Suppose User enter 5 and it is stored in num. DRY RUN for above Recusive fucntion calls is: num return (num * fact(num - 1)) Stored in STACK 5 5 * fact(4) 4 4 * fact(3) 3 3 * fact(2) 2 2 * fact(1) So following return statement stored into STACK is: 5 * fact(4) 4 * fact(3) 3 * fact(2) 2 * fact(1) and finally evaluated in reverse direction as per STACK data structure: return 2 * 1 = 2 return 3 * 2 = 6 return 4 * 6 = 24 return 5 * 24 = 120 So final result of this program is- Factorial is : 120 read less
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When a function calls itself, then that function is referred as recursive function. Example: void rec( ) { // Recursive function named rec( ) rec( ); // Function named rec( ) is calling itself } int main( ) // main( ) function { rec( ); // function named rec( ) is called for the first...
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When a function calls itself, then that function is referred as recursive function. Example: void rec( ) { // Recursive function named rec( ) rec( ); // Function named rec( ) is calling itself } int main( ) // main( ) function { rec( ); // function named rec( ) is called for the first time from main( ) function } read less
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When ever there is a requirement of performing same task number of times we will go for recursion. Calling function with in it is called recursive function we use this recursion in divide and conquer, tree traverse these are the few examples.
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Recursion means the function repeats until the professor completes.
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Recursion means the function repeats until the process completes.
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int main() { static int i; printf("pragati"); if(++i<10)main(); return 0; } o/p: pragati 10 times. description: i should be static so that each time main will be called, it will not be re initialized. if it will be so, code will be dumped after few iteration.
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I hope you do know what if recursive function. In programming language recursive function is a function which calls itself. Any repetitive task can be accomplished using recursive function. The main concern about writing a recursive function is to define the exit condition from the repetitive task. Let...
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I hope you do know what if recursive function. In programming language recursive function is a function which calls itself. Any repetitive task can be accomplished using recursive function. The main concern about writing a recursive function is to define the exit condition from the repetitive task. Let us take an example of factorial problem. Mathematically, factorial(N) = N * factorial(N-1). that is the function calls the same function by reducing the value by 1. Now here the repetitive process ends when the argument becomes 1 or 0 because factorial(1) = 1 and factorial(0) = 1, here it does not require to call the same function. So this the exit condition for that particular problem. we can write the function in C like this int factorial (int arg) { if(arg == 0 || arg == 1) // exit condition return 1; else return arg * factorial(arg - 1); } read less
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