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//program to input a string and replace each space with a hyphen(-) using for loop #include<conio.h> #include<stdio.h> void main() { char str[20]; int i; clrscr(); printf("\nenter a string "); gets(str); for(i=0;str[i]!='\0';i++) { if(str[i]==' ') { str[i]='-'; } } printf("\nconverted string is %s",str); getch(); }