Multiple conditions for if statement in C / C++ Strings in C/C++ with examples
In the previous tutorial, we learned about strings in C/C++. In this tutorial, we will learn about strings in C/C++ with examples. This is one of the basic knowledge in C/C++ programming language, so please learn it carefully.
Top 10 strings in C/C++ with example
Here, we will implement examples using strings in C/C++ from basic to advanced. For each example, we will implement with two different languages C and C++.
Example 1: Import and export strings in C/C++
C++ programming:
#include <iostream>
#include <string>
using namespace std;
int main()
{
char str1[100];
char str2[100];
char str3[100];
cout<<"Enter string str1: ";
cin>>str1;
cout<<"Enter string str2: ";
cin>>str2;
cout<<"Enter string str3: ";
cin>>str3;
cout<<"str1: "<<str1<<endl;
cout<<"str2: "<<str2<<endl;
cout<<"str3: "<<str3<<endl;
cout<<"\n-------------------------------\n";
cout<<"This program is posted at learnnc.com";
return 0;
}C programming:
#include <stdio.h>
int main(void) {
char str1[100];
char str2[100];
char str3[100];
printf("Enter string str1: ");
scanf("%s", str1);
printf("Enter string str2: ");
scanf("%s", str2);
printf("Enter string str3: ");
scanf("%s", str3);
printf("str1: %s\n",str1);
printf("str2: %s\n",str2);
printf("str3: %s\n",str3);
printf("\n-------------------------------\n");
printf("This program is posted at learnnc.com");
return 0;
}Output:
Example 2: Reverse strings in C/C++
C++ programming:
#include <iostream>
#include <string>
using namespace std;
int Length(char s[])
{
int i = 0;
while (s[i] != NULL)
++i;
return i - 1;
}
char* Reverse(char str[])
{
int length = Length(str);
char* temp = new char[length + 1];
for (int i = 0; i < length; i++)
{
temp[i] = str[length - 1 - i];
}
temp[length] = NULL;
return temp;
}
void PrintfReverse(char str[]) {
int length = Length(str);
cout<<"\nString after reverse: ";
for (int i = length - 1; i >= 0; i--)
{
cout<<str[i];
}
}
int main()
{
char s[100];
cout<<"\nEnter a string: ";
fgets(s, 100, stdin);
char* kq = Reverse(s);
PrintfReverse(s);
cout<<"\n-------------------------------\n";
cout<<"This program is posted at learnnc.com";
return 0;
}C programming:
#include <stdio.h>
#include <stdbool.h>
int Length(char s[])
{
int i = 0;
while (s[i] != NULL)
++i;
return i - 1;
}
char* Reverse(char str[])
{
int length = Length(str);
char* temp = new char[length + 1];
for (int i = 0; i < length; i++)
{
temp[i] = str[length - 1 - i];
}
temp[length] = NULL;
return temp;
}
void PrintfReverse(char str[]) {
int length = Length(str);
printf("\nString after reverse: ");
for (int i = length - 1; i >= 0; i--)
{
printf("%c", str[i]);
}
}
int main(void) {
char s[100];
printf("\nEnter a string: ");
fgets(s, 100, stdin);
char* kq = Reverse(s);
PrintfReverse(s);
printf("\n-------------------------------\n");
printf("This program is posted at learnnc.com");
return 0;
}Output:
Example 3: Concatenate two strings in C/C++
C++ programming:
#include <iostream>
#include <string>
using namespace std;
int main()
{
char str1[100], str2[100], i, j;
cout<<"Enter first string: ";
cin>>str1;
cout<<"Enter second string: ";
cin>>str2;
for(i=0; str1[i]!='\0'; ++i);
for(j=0; str2[j]!='\0'; ++j, ++i)
{
str1[i]=str2[j];
}
str1[i]='\0';
cout<<"Result: "<<str1;
cout<<"\n-------------------------------\n";
cout<<"This program is posted at learnnc.com";
return 0;
}C programming:
#include <stdio.h>
#include <stdbool.h>
int main(void) {
char str1[100], str2[100], i, j;
printf("Enter first string: ");
scanf("%s", &str1);
printf("Enter second string: ");
scanf("%s", &str2);
for(i=0; str1[i]!='\0'; ++i);
for(j=0; str2[j]!='\0'; ++j, ++i)
{
str1[i]=str2[j];
}
str1[i]='\0';
printf("Result: %s",str1);
printf("\n-------------------------------\n");
printf("This program is posted at learnnc.com");
return 0;
}Output:
Example 4: Find the length of strings in C/C++
C++ programming:
#include <iostream>
#include <cstring>
using namespace std;
int main()
{
char str[100];
int length;
cout<<"Enter a string: ";
cin>>str;
length = strlen(str);
cout<<"The length of the string is: "<<length;
cout<<"\n-------------------------------\n";
cout<<"This program is posted at learnnc.com";
return 0;
}C programming:
#include <stdio.h>
#include <stdbool.h>
int main(void) {
char str[100];
int length;
printf("Enter a string: ");
scanf("%s", str);
length = strlen(str);
printf("The length of the string is: %d",length);
printf("\n-------------------------------\n");
printf("This program is posted at learnnc.com");
return 0;
}Output:
Example 5: Sort strings in C/C++ in Alphabetical order
C++ programming:
#include <iostream>
#include <cstring>
using namespace std;
int main()
{
int i,j,count;
char str[25][25],temp[25];
cout<<"How many strings do you want to enter: ";
cin>>count;
cout<<"Enter the strings: \n";
for(i=0;i<count;i++)
cin>>str[i];
for(i=0;i<count;i++)
for(j=i+1;j<count;j++){
if(strcmp(str[i],str[j])>0){
strcpy(temp,str[i]);
strcpy(str[i],str[j]);
strcpy(str[j],temp);
}
}
cout<<"The strings after sorting are:\n";
for(i=0;i<=count;i++)
puts(str[i]);
cout<<"\n-------------------------------\n";
cout<<"This program is posted at learnnc.com";
return 0;
}C programming:
#include <stdio.h>
int main(void) {
int i,j,count;
char str[25][25],temp[25];
printf("How many strings do you want to enter: ");
scanf("%d", &count);
printf("Enter the strings: \n");
for(i=0;i<count;i++)
scanf("%s", &str[i]);
for(i=0;i<count;i++)
for(j=i+1;j<count;j++){
if(strcmp(str[i],str[j])>0){
strcpy(temp,str[i]);
strcpy(str[i],str[j]);
strcpy(str[j],temp);
}
}
printf("The strings after sorting are:\n");
for(i=0;i<=count;i++)
puts(str[i]);
printf("\n-------------------------------\n");
printf("This program is posted at learnnc.com");
return 0;
}Output:
Example 6: Convert uppercase strings to lowercase strings in C/C++
C++ programming:
#include <iostream>
#include <cstring>
using namespace std;
int main()
{
char str[25];
int i;
cout<<"Enter a string: ";
fgets(str,25,stdin);
for(i=0;i<=strlen(str);i++){
if(str[i]>=65&&str[i]<=90)
str[i]=str[i]+32;
}
cout<<"After converting to lowercase: "<<str;
cout<<"\n-------------------------------\n";
cout<<"This program is posted at learnnc.com";
return 0;
}C programming:
#include <stdio.h>
int main(void) {
char str[25];
int i;
printf("Enter a string: ");
fgets(str,25,stdin);
for(i=0;i<=strlen(str);i++){
if(str[i]>=65&&str[i]<=90)
str[i]=str[i]+32;
}
printf("After converting to lowercase: %s ",str);
printf("\n-------------------------------\n");
printf("This program is posted at learnnc.com");
return 0;
}Output:
Example 7: Convert lowercase strings to uppercase strings in C/C++
C++ programming:
#include <iostream>
#include <cstring>
using namespace std;
int main()
{
char str[25];
int i;
cout<<"Enter a string: ";
fgets(str,25,stdin);
for(i=0;i<=strlen(str);i++){
if(str[i]>=97&&str[i]<122)
str[i]=str[i]-32;
}
cout<<"After converting to uppercase: "<<str;
cout<<"\n-------------------------------\n";
cout<<"This program is posted at learnnc.com";
return 0;
}C programming:
#include <stdio.h>
int main(void) {
char str[25];
int i;
printf("Enter a string: ");
fgets(str,25,stdin);
for(i=0;i<=strlen(str);i++){
if(str[i]>=97&&str[i]<=122)
str[i]=str[i]-32;
}
printf("After converting to uppercase: %s ",str);
printf("\n-------------------------------\n");
printf("This program is posted at learnnc.com");
return 0;
}Output:
Example 8: Compare two strings in C/C++
C++ programming:
#include <iostream>
#include <cstring>
using namespace std;
int main()
{
char lhs[100];
char rhs[100];
cout<<"Enter the first string: ";
cin>>lhs;
cout<<"Enter the second string: ";
cin>>rhs;
int result;
result = strcmp(lhs,rhs);
if(result != 0)
cout<<lhs<< " and " << rhs <<" different";
else
cout<<lhs<< " and " << rhs <<" alike";
cout<<endl<<endl;
result = strcmp(lhs,lhs);
if(result != 0)
cout<<lhs<< " and " << lhs <<" different";
else
cout<<lhs<< " and " << lhs <<" alike";
cout<<"\n-------------------------------\n";
cout<<"This program is posted at learnnc.com";
return 0;
}C programming:
#include <stdio.h>
int main(void) {
char lhs[100];
char rhs[100];
printf("Enter the first string: ");
scanf("%s", lhs);
printf("Enter the second string: ");
scanf("%s", rhs);
int result;
result = strcmp(lhs,rhs);
if(result != 0)
printf("%s and %s different", lhs,rhs);
else
printf("%s and %s alike", lhs,rhs);
printf("\n\n");
result = strcmp(lhs,lhs);
if(result != 0)
printf("%s and %s different", lhs,lhs);
else
printf("%s and %s alike", lhs,lhs);
printf("\n-------------------------------\n");
printf("This program is posted at learnnc.com");
return 0;
}Output:
Example 9: Searching for ch character in string in C/C++
C++ programming:
#include <iostream>
#include <cstring>
using namespace std;
int main()
{
char str[100];
char ch;
cout<<"Enter a string: ";
fgets(str, 100, stdin);
cout<<"Enter a characters: ";
cin>>ch;
if (strchr(str, ch))
cout << "Characters " << ch << " exist in string \"" << str << "\"";
else
cout << "Characters " << ch << " not exist in string \"" << str << "\"";
cout<<"\n-------------------------------\n";
cout<<"This program is posted at learnnc.com";
return 0;
}C programming:
#include <stdio.h>
int main(void) {
char str[100];
char ch;
printf("Enter a string: ");
fgets(str, 100, stdin);
printf("Enter a characters: ");
scanf("%c", &ch);
if (strchr(str, ch))
printf("Characters %c exist in string \"%s\"",ch,str);
else
printf("Characters %c not exist in string \"%s\"",ch,str);
printf("\n-------------------------------\n");
printf("This program is posted at learnnc.com");
return 0;
}Output:
Example 10: Checks for the existence of a string str in strings in C/C++.
C++ programming:
#include <iostream>
#include <cstring>
using namespace std;
int main()
{
char str1[100];
char str2[100];
cout<<"Enter the first string: ";
cin>>str1;
cout<<"Enter the second string: ";
cin>>str2;
if (strstr(str1, str2))
cout<<"String \""<<str1<<"\" exist in string \""<<str2<<"\"";
else
cout<<"String \""<<str1<<"\" not exist in string \""<<str2<<"\"";
cout<<"\n-------------------------------\n";
cout<<"This program is posted at learnnc.com";
return 0;
}C programming:
#include <stdio.h>
int main(void) {
char str1[100];
char str2[100];
printf("Enter the first string: ");
scanf("%s", &str1);
printf("Enter the second string: ");
scanf("%s", &str2);
if (strstr(str1, str2))
printf("String \"%s\" exist in string \"%s\"",str1,str2);
else
printf("String \"%s\" not exist in string \"%s\"",str1,str2);
printf("\n-------------------------------\n");
printf("This program is posted at learnnc.com");
return 0;
}Output:
