(They are all relatively basic small programs, you can take a look at them, such as many. It's a pity that all the comments are in English, so it should be effective.
900 examples of classic programming (C language)\ABC\BIT_INV.txt
900 examples of classic programming (C language)\ABC\BIT_OR.txt
900 examples of classic programming (C language)\ABC\BIT_XOR.txt
900 cases of classic programming (C language)\ABC\CHAR_OUT.txt
900 examples of classic programming (C language)\ABC\CON_VOWL.txt
900 examples of classic programming (C language)\ABC\DO_MENU.txt
900 cases of classic programming (C language)\ABC\EXP_FMT.txt
900 examples of classic programming (C language)\ABC\EXP_OUT.txt
900 cases of classic programming (C language)\ABC\FLOATOUT.txt
900 cases of classic programming (C language)\ABC\FLT_FMT.txt
900 cases of classic programming (C language)\ABC\FLT_PT.txt
900 cases of classic programming (C language)\ABC\FOR_2VAR.txt
900 examples of classic programming (C language)\ABC\FOR_DIFF.txt
900 examples of classic programming (C language)\ABC\FOR_DOWN.txt
900 cases of classic programming (C language)\ABC\FOR_MORE.txt
900 cases of classic programming (C language)\ABC\FOR_TEST.txt
900 cases of classic programming (C language)\ABC\FULL_FMT.txt
900 examples of classic programming (C language)\ABC\GOTO_100.txt
900 examples of classic programming (C language)\ABC\INFINITE.txt
900 examples of classic programming (C language)\ABC\INTOUT.txt
900 cases of classic programming (C language)\ABC\INT_FMT.txt
900 examples of classic programming (C language)\ABC\ITEM.txt
900 examples of classic programming (C language)\ABC\LEFTJUST.txt
900 cases of classic programming (C language)\ABC\LONGOUT.txt
900 examples of classic programming (C language)\ABC\MATH.txt
900 examples of classic programming (C language)\ABC\MODULO.txt
900 examples of classic programming (C language)\ABC\NEAR_FAR.txt
900 examples of classic programming (C language)\ABC\NOOUTPUT.txt
900 cases of classic programming (C language)\ABC\NO_CONT.txt
900 cases of classic programming (C language)\ABC\NO_PRINT.txt
.....too many files .....)