How can we use realloc() in C?

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D Subba Rao

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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