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//program to convert a string to upper case without using strupr function #include<stdio.h> #include<conio.h> void main() { char str[10]; int i; clrscr(); printf("\nenter a string "); gets(str); printf("\noriginal string is %s",str); for(i=0;str[i]!='\0';i++) { if((str[i]>='a') && (str[i]<='z')) { str[i]=str[i]-32; } } printf("\nconverted string is %s",str); getch(); }