This is my machine exam for the C language competition.

Question 1:

# Include <stdio. h> # include <string. h> # include <stdlib. h> # define N 30 /********************************* * ************** Function Name: fun * Creation Time: 2010.12.5 * Author: huangliangming * Description: sorts a string, with the letters at the top and numbers at the bottom, it does not change the character sequence between original letters and numbers. * Parameter: char * s, int * m * return value: chletter (first element address of the array chletter []) * local variable: Char chletter [N]; * char chnumber [N]; * int I, J, K; **************************************** * ******/char * Fun (char * s, int * m) // The Parameter m is generated after debugging. {char chletter [N]; // It is used to store the letter char chnumber [N]; // It is used to store the number int I, j, k; I = 0; // initialize J = 0; // J is used to record the number of letters K = 0; // K is used to record the number of numbers for (I = 0; I <n; I ++) {If (s [I]> = 'A' & S [I] <= 'Z' // Save the letter to chletter [] | s [I]> =' a' & S [I] <= 'Z ') {chletter [J] = s [I]; j ++;} If (s [I]> = '0' & S [I] <= '9 ') // Save the number to chnumber [] {chnumber [k] = s [I]; k ++ ;}} chletter [J] = '\ 0 '; chnumber [k] = '\ 0'; * m = J + k; // returns the number of characters in the last Input and Output. strcat (chletter, chnumber); Return chletter ;} // main function void main () {char s [N]; int I; int m; char * P; P = NULL; printf ("enter a string (less than 30 characters): \ n "); scanf (" % s ", S); P = fun (S, & M ); // At the beginning, this m was not defined to limit the length of the array indicated by the pointer P. The following two characters are garbled for (I = 0; I <m; I ++) // copy the returned value to the array to be output {s [I] = P [I];} printf ("Result:"); for (I = 0; I <m; I ++) // output result {printf ("% C", s [I]);} printf ("\ n ");}

 

Question 2:

# Include <stdio. h> # include <string. h> # include <stdlib. h> # define N 30 // s refers to the maximum length of the string # define T 2 // The length of the string indicated by T1 and T2 /************ * *********************************** Function Name: fun * Creation Time: 2010.12.5 * Author: huangliangming * description: replace the last occurrence of the substring in the string s that is the same as that in the string T1 with the string * parameter: char * s, char * T1, char * t2, int * m * return value: w (address of the first element of the array W []) * local variable: Char W [N]; * char temp [T]; * char t1temp [T]; * int I, J, K, L; **************************************** * ******/char * Fun (char * s, char * T1, char * t2, int * m) // The role of m is the same as that of the first question. The last two characters without m will be garbled (for other methods) {char W [N]; // It is used to store the processed string char temp [T]; // It is used to store the substring char t1temp [T] intercepted from the string indicated by S; // used to store the int I, J, K, L strings specified by T1; // store the for (I = 0; I <t; I ++) string specified by T1 to t1temp) {t1temp [I] = T1 [I];} t1temp [T] = '\ 0'; // evaluate the value referred to by m for (I = 0; I <N; I ++) {If (s [I] = '\ 0') {* m = I ;}} // search for the subscript for (I = 0; I <n; I ++) {L = 0; For (j = I; j <(I + T); j ++, l ++) // truncate the child string with a length of T and store it in temp [] {temp [l] = s [J];} temp [T] = '\ 0 '; if (strcmp (t1temp, temp) = 0) {k = I; // subscript of the last character in the same K record} for (I = 0; I <n; I ++) // assign a value to W [] {J = 0; if (I >=k & I <(K + T )) // start changing the value at the K point {W [I] = t2 [J]; // changing the value J ++ ;} else {W [I] = s [I] ;}} return W ;}// main function void main () {char s [N]; char T1 [T]; char T2 [T]; int I; int m; char * P; P = NULL; printf ("enter a string (less than 20 characters ):"); scanf ("% s", S); printf ("Enter the substring to be replaced (only two characters):"); scanf ("% s", T1 ); printf ("Enter the character string to be replaced (only two characters):"); scanf ("% s", T2); P = fun (S, T1, T2, & M); for (I = 0; I <m; I ++) // copy the returned value to the array to be output {s [I] = P [I];} printf ("Result:"); for (I = 0; I <m; I ++) // output result {printf ("% C", s [I]);} printf ("\ n ");}

 

Question 3:

# Include <stdio. h> # include <stdlib. h> # include <string. h> # define N 30 /********************************* * ************** Function Name: fun * Creation Time: 2010.12.6 * OPERATOR: huangliangming * Description: delete characters with odd ASCII values in the strings referred to by S, the remaining characters in the string form a new string and place it in the array specified by T. * Parameter: char * s, int * m * return value: Return T, (t indicates the pointer to the array) * local variable: char * t; * char temp [N]; * int I, j = 0; **************************************** * ******/char * Fun (char * s, int * m) {char * t; char temp [N]; // a temporary array used to store int I, J = 0; t = temp; for (I = 0; I <n; I ++) {If (s [I] % 2 = 0) {temp [J] = s [I]; // if it is an even number, assign the value to the array J ++ pointed by T; If (s [I] = '\ 0 ') // find the m value. First, you need to find the number of characters {break ;}} * m = J; // find the m value, that is, the length of the output result t [J] = '\ 0'; return t;} // main function void main () {char s [N]; int I; int m; char * P; P = NULL; printf ("enter a string (less than 30 characters): \ n"); scanf ("% s ", s); P = fun (S, & M ); // At the beginning, this m was not defined to limit the length of the array indicated by the pointer P. The following two characters are garbled for (I = 0; I <m; I ++) // copy the returned value to the array to be output {s [I] = P [I];} printf ("Result:"); for (I = 0; I <m; I ++) // output result {printf ("% C", s [I]);} printf ("\ n ");}

 

if you have any questions, let's discuss them.