1) Use code tags please... << !! Posting Code? Read this First !! >>
2) You should usually post compilable code in case people want to test it.
3) Read up on strings a little bit more...
Code:
char cName[10] = {0};
printf("\nGreetings\n");
printf("\nPlease tell us your name : ");
scanf("%9s", cName);
printf("\nWelcome %s", cName);
It should come as no surprise that a char can only hold 1 character...
In C strings are arrays of characters where the last used element of the array is tagged with a trailing 0.
The library functions cooperate to treat these arrays like text.