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c program to perform all string operation without using library function using switch case
#include
#include
int slength(char s1[10]);
void srev(char s1[10]);
void toupper(char s1[10]);
void tolower(char s1[10]);
void scpy(char s1[],char s2[]);
void ssubstr(char s1[],char s2[]);
void sconcat(char s1[],char s2[]);
void scompare(char s1[],char s2[]);
void main()
{
int len=0,ch;
char s1[10]="";
char s2[10]="";
clrscr();
while(1)
{
printf("\n---------------Menu---------------------\n");
printf("1.length\n2.Reverse\n3.copy\n4.concate\n5.compare\n");
printf("6.substring\n7.toupper\n8.tolower\n9.exit\n");
printf("-------------------------------------------\n");
printf("\nEnter ur choice:");
scanf("%d",&ch);
switch(ch)
{
case 1: printf("\n Enter string:");
fflush(stdin);
gets(s1);
len=slength(s1);
printf("\n String length is:%d",len);break;
case 2: printf("\n Enter string:");
fflush(stdin);
gets(s1);
srev(s1);break;
case 3: printf("\n Enter string :");
fflush(stdin);
gets(s2);
scpy(s1,s2);break;
case 4: printf("\n Enter string first:");
fflush(stdin);
gets(s1);
printf("\n Enter string second:");
gets(s2);
sconcat(s1,s2);break;
case 5: printf("\n Enter string first:");
fflush(stdin);
gets(s1);
printf("\n Enter string second:");
gets(s2);
scompare(s1,s2);break;
case 6: printf("\n Enter string first:");
fflush(stdin);
gets(s1);
printf("\n Enter string second:");
gets(s2);
ssubstr(s1,s2);break;
case 7: printf("\n Enter string:");
fflush(stdin);
gets(s1);
toupper(s1);break;
case 8: printf("\n Enter string:");
fflush(stdin);
gets(s1);
tolower(s1);break;
case 9:exit(0);
}
getch();
}
}
int slength(char s1[10])
{ int i;
for(i=0;s1[i]!='\0';i++);
return i;
}
void toupper(char s1[10])
{ int i,x;
for(i=0;i
if(x >= 65 && x <= 90)
s1[i]=s1[i];
else
s1[i]=x-32;
}
printf("%s",s1);
}
void tolower(char s1[10])
{ int i,x;
for(i=0;i
if(x >= 97 && x <= 122)
s1[i]=s1[i];
else
s1[i]=x+32;
}
printf("%s",s1);
}
void ssubstr(char s1[],char s2[])
{ int i,j,flag=0;
char ch;
ch=s1[0];
for(i=0;s1[i]!='\0';i++)
{
if(s2[0]==s1[i])//&&slength(s2)!=1||s1[slength(s1)-1]==s2[0])
for(j=0;s2[j]!='\0';j++)
if(s1[i]==s2[j]&& (ch==s1[i-1]||s1[slength(s1)-1]==s2[0]))
{
ch=s1[i];
flag=1;
}
else
flag=1;
}
if(flag==1)
printf("\n String is substring:");
else
printf("\n String is not substring:");
}
void srev(char s1[10])
{
int i,temp,j;
int l=slength(s1);
for(i=0,j=l-1;i
temp=s1[i];
s1[i]=s1[j];
s1[j]=temp;
}
printf("\n %s",s1);
}
void scpy(char s1[],char s2[])
{
int i,j;
for(i=0,j=0;s2[j]!='\0';i++,j++)
s1[i]=s2[j];
s1[i]='\0';
printf("\n New string in s1:%s",s1);
}
void sconcat(char s1[],char s2[])
{
int i,j;
for(i=slength(s1),j=0;s2[j]!='\0';i++,j++)
s1[i]=s2[j];
s1[i]='\0';
printf("\n String after concat:%s",s1);
}
void scompare(char s1[],char s2[])
{ int i,flag=0;
for(i=0;s1[i]!='\0'&&s2[i]!='\0';i++)
{ if(s1[i]==s2[i])
flag=1;
else
flag=0;
}
if(flag==1)
printf("\n strings are equals");
else
printf("\n strings are not equals");
}