Please explain to me when and why we use backslash characters?

printf("printf(\"hello! \") will print \"hello\", and starts a new line. "); 7. In and %d Start a Hello World program. Modify the printed text: printf("Hello world !"); What happens? What happens when using two backslash characters Il ? printf("Hello world!\ "); Print out the patterns below using one single printf() statement in each case. printf("hello ") will print "hello", and starts a new line. Using "%d" we can print the value of an integer variable. B Solution #include int main(void) { /* top left output: */ printf(" A / / "); /* top right output: */ printf("\\ \\ \\ "); /* bottom left output: */ printf("printf(\"hello! \") will print "hello\", and starts a new line. "); /* bottom right output: */ printf("Using \"%%d\" we can print the value of an integer variable. "); return 0; }