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C Language > Learn C Language > How can we use realloc() in C?
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How can we use realloc() in C?

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realloc() is used to resize the memory. Suppose if you have more memory then you can reduce it or if you have less memory then you can increase it.
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realloc() is used to change the size of memory block without losing the old data. It takes 2 arguments. syntax : ptr=(datatype *)realloc(ptr, newsize) ->ptr is the pointer to the memory block which is previously allocated by malloc, calloc or realloc. It holds the starting address of the memory block....
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realloc() is used to change the size of memory block without losing the old data. It takes 2 arguments. syntax : ptr=(datatype *)realloc(ptr, newsize) ->ptr is the pointer to the memory block which is previously allocated by malloc, calloc or realloc. It holds the starting address of the memory block. ->newsize is the new size for the memory block. for ex: ptr = (int *)malloc(2*sizeof(int)); // this allocates memory for 2 integers If the memory is to be increased for 3 more integers without losing the previous integers data, then realloc is used as ptr = (int *)realloc(ptr, 5*sizeof(int));. read less
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Sr. Software Engineer at Bureau Veritas, former Sr. Software Consultant at Aptech Malviynagar

realloc(-,-) function is used to re-allocate or resize the previously allocated memory.for example,suppose you have allocated memory like- int *p=(int*)malloc(4*sizeof(int));//here 8bytes of memory gets allocated Now you want to change the size of existing memory that you have created.so here we can...
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realloc(-,-) function is used to re-allocate or resize the previously allocated memory.for example,suppose you have allocated memory like- int *p=(int*)malloc(4*sizeof(int));//here 8bytes of memory gets allocated Now you want to change the size of existing memory that you have created.so here we can use the realloc(-,-) function to alter the size like- p=realloc(p,10*sizeof(int));//here size will be 20bytes Hope this will answer your question. Good Luck! read less
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