String Functions - Length, Concatenate, Reverse, Copy, Combine, Compare & Extract

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 //PROGRAM TO ERFORM STRING FUNCTION - STRING LENGTH, COPY, CONCATENATE, REVERSE, COMBINE, EXTRACT & COMPARE  
 //Downloaded from www.c4cprog.co.nr  
 #include<conio.h>  
 void string_length()  
 {  
 int i=0;  
 char str[100];  
 gets(str);  
 printf("\n\nEnter The String : ");  
 gets(str);  
 while(str[i]!='\0')  
 i++;  
 printf("\n\nLENGTH Of The String is : %d Characters",i);  
 }  
 void string_concatenate()  
 {  
 int i=0,p=0;  
 char str1[100],str2[100];  
 gets(str1);  
 printf("\n\nEnter The String : ");  
 gets(str1);  
 printf("\nEnter The String B : ");  
 gets(str2);  
 while(str1[p]!='\0')  
 p++;  
 for(i=0;str2[i]!='\0';i++,p++)  
 str1[p]=str2[i];  
 printf("\n\nThe CONCATENATED String is : ");  
 for(i=0;i<p;i++)  
 printf("%c",str1[i]);  
 }  
 void string_reverse()  
 {  
 int i=0,p=0,q=0;  
 char str1[100],str2[100];  
 gets(str1);  
 printf("\n\nEnter The String : ");  
 gets(str1);  
 while(str1[p]!='\0')  
 p++;  
 for(i=p-1;i>=0;i--,q++)  
 str2[i]=str1[q];  
 printf("\n\nREVERSED String : ");  
 for(i=0;i<q;i++)  
 printf("%c",str2[i]);  
 }  
 void string_copy()  
 {  
 int i=0,p=0;  
 char str1[100],str2[100];  
 gets(str1);  
 printf("\n\nEnter The String : ");  
 gets(str1);  
 while(str1[p]!='\0')  
 p++;  
 for(i=0;i<p;i++)  
 str2[i]=str1[i];  
 printf("\n\nCOPIED String : ");  
 for(i=0;i<p;i++)  
 printf("%c",str2[i]);  
 }  
 void string_combine()  
 {  
 int i=0,p=0,j;  
 char str1[100],str2[100],str3[100];  
 gets(str1);  
 printf("\n\nEnter The String : ");  
 gets(str1);  
 printf("\nEnter The String B : ");  
 gets(str2);  
 while(str1[p]!='\0')  
 p++;  
 for(i=0;i<p;i++)  
 str3[i]=str1[i];  
 for(j=0;str2[j]!='\0';j++,i++)  
 str3[i]=str2[j];  
 printf("\n\nThe COMBINED String is : ");  
 for(j=0;j<i;j++)  
 printf("%c",str3[j]);  
 }  
 void string_compare()  
 {  
 int p=0,q=0,d=0,e=0,k=0,i,t;  
 char str1[100],str2[100];  
 gets(str1);  
 printf("\nEnter The String A : ");  
 gets(str1);  
 printf("\nEnter The String B : ");  
 gets(str2);  
 while(str1[p]!='\0')  
 p++;  
 while(str2[q]!='\0')  
 q++;  
 if(p>q)  
 t=p;  
 else  
 t=q;  
 for(i=0;i<t;i++,d=0,e=0)  
 {  
 d=str1[i];  
 e=str2[i];  
 if(d!=e)  
 {  
 k++;  
 printf("\n\nRESULT = %d | The Strings Are NOT EQUAL",d-e);  
 break;  
 }}  
 if(k==0)  
 printf("\n\nTHE STRINGS ARE EQUAL");  
 }  
 void string_extract()  
 {  
 int o,q,j,p=0,i,t;  
 char str[100],str1[100];  
 gets(str);  
 printf("\n\nEnter The String : ");  
 gets(str);  
 printf("\n\nEnter The Position From Which Extraction Is To Be Done : ");  
 scanf("%d",&o);  
 printf("\n\nEnter The Length Of The String To Be Extracted : ");  
 scanf("%d",&q);  
 while(str[p]!='\0')  
 p++;  
 if(p-o<q)  
 t=p-0;  
 else  
 t=q;  
 for(i=0;i<p;i++)  
      if(i==(o-1))  
      for(j=0;j<q;j++,i++)  
      str1[j]=str[i];  
 printf("\n\nThe EXTRACTED String is : ");  
 for(j=0;j<t;j++)  
 printf("%c",str1[j]);  
 }  
 void main()  
 {  
 int op;  
 char v;  
 do{  
 clrscr();  
 printf("\nOPTIONS :\n\t1.Length Of String\n\t2.Concatinating String\n\t3.Reversing String\n\t4.Copy String\n\t5.Combine Strings\n\t6.Comparing Strings\n\t7.Extracting String\n\n\nEnter Choice :");  
 scanf("%d",&op);  
 switch(op)  
 {  
 case 1:  
      string_length();  
      break;  
 case 2:  
      string_concatenate();  
      break;  
 case 3:  
      string_reverse();  
      break;  
 case 4:  
      string_copy();  
      break;  
 case 5:  
      string_combine();  
      break;  
 case 6:  
      string_compare();  
      break;  
 case 7:  
      string_extract();  
      break;  
 default:  
      printf("\n\nINVALID CHOICE !!!");  
      break;  
 }  
 printf("\n\n\n\nPress 'e' To EXIT & Any Other Key To Continue : ");  
 scanf(" %c",&v);  
 }while(v!='e');  
 }  
 /*  
 OUTPUT  
 OPTIONS :  
      1.Length Of String  
      2.Concatinating String  
      3.Reversing String  
      4.Copy String  
      5.Combine Strings  
      6.Comparing Strings  
      7.Extracting String  
 Enter Choice :1  
 Enter The String : Checking The Length  
 LENGTH Of The String is : 19 Characters  
 Press 'e' To EXIT & Any Other Key To Continue : c  
 OPTIONS :  
      1.Length Of String  
      2.Concatinating String  
      3.Reversing String  
      4.Copy String  
      5.Combine Strings  
      6.Comparing Strings  
      7.Extracting String  
 Enter Choice :2  
 Enter The String : Checking  
 Enter The String B : Concatination  
 The CONCATENATED String is : CheckingConcatination  
 Press 'e' To EXIT & Any Other Key To Continue : c  
 OPTIONS :  
      1.Length Of String  
      2.Concatinating String  
      3.Reversing String  
      4.Copy String  
      5.Combine Strings  
      6.Comparing Strings  
      7.Extracting String  
 Enter Choice :3  
 Enter The String : Checking String Reverse  
 REVERSED String : esreveR gnirtS gnikcehC  
 Press 'e' To EXIT & Any Other Key To Continue : c  
 OPTIONS :  
      1.Length Of String  
      2.Concatinating String  
      3.Reversing String  
      4.Copy String  
      5.Combine Strings  
      6.Comparing Strings  
      7.Extracting String  
 Enter Choice :4  
 Enter The String : Copying A String  
 COPIED String : Copying A String  
 Press 'e' To EXIT & Any Other Key To Continue : c  
 OPTIONS :  
      1.Length Of String  
      2.Concatinating String  
      3.Reversing String  
      4.Copy String  
      5.Combine Strings  
      6.Comparing Strings  
      7.Extracting String  
 Enter Choice :5  
 Enter The String : Testing  
 Enter The String B : For Combining Strings  
 The COMBINED String is : TestingFor Combining Strings  
 Press 'e' To EXIT & Any Other Key To Continue : c  
 OPTIONS :  
      1.Length Of String  
      2.Concatinating String  
      3.Reversing String  
      4.Copy String  
      5.Combine Strings  
      6.Comparing Strings  
      7.Extracting String  
 Enter Choice :6  
 Enter The String A : String Comparing  
 Enter The String B : Is Tested  
 RESULT = 10 | The Strings Are NOT EQUAL  
 Press 'e' To EXIT & Any Other Key To Continue : c  
 OPTIONS :  
      1.Length Of String  
      2.Concatinating String  
      3.Reversing String  
      4.Copy String  
      5.Combine Strings  
      6.Comparing Strings  
      7.Extracting String  
 Enter Choice :7  
 Enter The String : Sting Is To Be Extracted  
 Enter The Position From Which Extraction Is To Be Done : 2  
 Enter The Length Of The String To Be Extracted : 6  
 The EXTRACTED String is : ting I  
 Press 'e' To EXIT & Any Other Key To Continue : e  
 */