Second experiment Report of C language

11-1 local maxima of the matrix

Given m line n column integer Matrix a, if a Non-boundary elements [is larger than the next 4 elements, then the element [is the local maximum value of the matrix. The subject requires the full local maxima of the given matrix and its location.

#include <stdio.h>
int main ()
{
int m,n;
scanf ("%d%d", &m, &n);
int A[m][n], I, J;
for (i = 0; i < m; i++) {
for (j = 0; J < N; j + +) {
scanf ("%d", &a[i][j]);
}
}
int flag = 0;
for (i = 1; i < m-1; i++) {
for (j = 1; j < N-1; J + +) {
if (A[i][j] > A[i][j-1] && a[i][j] > a[i][j+1] && a[i][j] > A[i-1][j] && a[i][j] > a[i+ 1][j]) {
printf ("%d%d%d\n", A[i][j], i+1, j+1);
flag = 1; } } }
if (flag = = 0) {
printf ("None%d%d", M, N);
}

return 0; }

Design ideas: By defining a two-bit array to store function values, it is worth noting the position of the maximum in the array and determining whether the condition is complete.

12-4 String Letter Case Conversion

The subject requires the program, to a "#" end of the string, its lowercase letters all converted to uppercase, all uppercase letters to lowercase letters, other characters do not change output.

#include <stdio.h>
int main ()
{
int i=1;
Char A;
while (i>0)
{
scanf ("%c", &a);
if (a!= ' # ')
{
if (a<=90&&a>=65)
{
printf ("%c", a+32);
}
else if (a>=97&&a<=122)
{
printf ("%c", a-32);
}
Else
{
printf ("%c", a);
}

}
Else
{
i=0;
}
}

return 0;
}

Design ideas: The use of ASCII code table order, that is, the difference between the uppercase and lowercase letters 32 compiled code implementation.

13-5 judging a palindrome string

The need to write a function to determine whether a given string of characters is a "palindrome". The so-called "palindrome" refers to both reading and reading the same string. such as "Xyzyx" and "Xyzzyx" are palindrome.

#include <iostream>
using namespace Std;
int fun (int., int high, char *str, int length)
{
if (length = = 0 | | length = = 1)
return 1;
if (Str[low]! = Str[high])
return 0;
Return Fun (low+1, high-1, str, length-2);
}
int main ()
{
Char str[]= "AAABDAAA";
int length = strlen (str);
cout << Fun (0, length-1, str, length) << Endl;
return 0;
}

Design ideas: Pay attention to the details of the topic, using recursive method to achieve.

14-2 deleting characters

The subject requires implementing a simple function that deletes a specified character from a string.

#include <stdio.h>
#include <string.h>
#define MAXN 20

void Delchar (Charchar *str, char c);

int main ()
{
Char str[maxn]= "Happy New Year", C;

scanf ("%c", &c);
Delchar (str, c);
printf ("%s\n", str);

return 0;
}

void Delchar (Charchar *str, char c) {
int I,j,len;

len = strlen (str);
printf ("Len =%d\n", Len);

for (i=0;i<len;i++) {
if (str[i]==c) {
for (j=i;j<len;j++)
STR[J]=STR[J+1];
}
}
str[j]= ' + ';
}

Design ideas: Create a new array to store, using the method of deleting characters.

15-1 splitting the integer and fractional parts of a real number

A simple function that requires the realization of an integer and fractional part of a split real number

void Splitfloat (float x, int *intpart, float *fracpart)
{
int *k;
float *j;
int m;
float N;
M=x;
N=x-m;
k=&m;
j=&n;
*intpart=*k;
*fracpart=*j;
}

Experiment thanks: Read the topic consciousness, the consciousness provides the condition, with the pointer to implement the code together.

C Language Second experiment report