strcpy(person->name,"John Doe"); } Reallocating memory:realloc()is used to resize previously allocated memory blocks. 1int*arr=malloc(10*sizeof(int)); 2if(arr!=NULL){ 3// Resize array to 20 integers 4int*temp=realloc(arr,20*sizeof(int)); ...
2) strcpy(destination, source) Copies the contents of source string to destination string. 3) strcat(first_string, second_string) Concats or joins first string with second string. The result of the string is stored in first string. 4) strcmp(first_string, second_string) Compares the first ...
2. Avoid Unbounded Write Operators in C++ Unbounded read or copy operators such as "strcpy" and "strcat" in C++, do not account for the limited capacity of buffers, so they often cause buffer overflow. Instead, C++ software developers should use “strncpy” and “strncat” operators. These ...
(1 << 20)), // Map from the start of the 2^20th page pagesize, // for one page length PROT_READ|PROT_WRITE|PROT_EXEC, MAP_ANON|MAP_PRIVATE, // to a private block of hardware memory 0, 0 ); if (region == MAP_FAILED) { perror("Could not mmap"); return 1; } strcpy(...
In the above structure, the name of the medicine should be dynamic. If the name of the medicine is less than MaxSize, it causes memory loss but if the medicine name greater than the MaxSize, your code can crash. With the help of struct hack, we can resolve the above issue and create...
“Error: type name is not allowed” message in editor but not during compile [ WinSocket 2 ] Flush socket [C\C++] - how get arrow keys(correctly) using getch()? [C\C++] - how put the window in center of screen and how avoid the user resize it? [C\C++] - key up and key dow...
39. What is keyword in C?Keywords are pre-defined words in a C compiler. Each keyword is meant to perform a specific function in a C program. Since keywords are referred names for compiler, they can’t be used as variable name.
What is Garbage? In C, pointers are used to access objects (C doesn’t have the concept of objects but I am using Java’s term here for Java developers to understand). In theory, developers can walk through the entire allocated memory area using pointers and access anything stored in the...
(void) {structpersonp;memset(&p,0,sizeof(structperson));strcpy(p.name,"Foo Bar");p.age=42;p.height=1.75;// mp.is_male=true;p.nbr_of_children=2;p.child_ages[0]=7;p.child_ages[1]=9;FILE*f=fopen("simple_example.dat","w");fwrite(&p,sizeof(structperson),1,f);fclose(f)...
One of the most serious issues that can occur when using glibc is buffer overflows. If a program uses functions such as gets() or strcpy() without proper bounds checking, it can lead to buffer overflows, which attackers can exploit to execute arbitrary code on the system. To prevent buffe...