hai i m new to linux OS and slow to pick up,so please bare my simple doubts. Something funny is happening in my system. pgm 1:n.c #include<stdio.h> main() { printf("hello'); } compiled gcc -o n n.c executed it ./n no output. pgm 2:h.c 3include<stdio.h> main() { int i,j,k; printf("Enter 2 nos"); scanf("%d %d",&i,&j); k=i+j; printf("%d",k); } compiled & executed in the similar way before gcc -o h h.c ./h (i got) Enter 2 nos2 3 (!!!!!!!!!then no output) pgm 3: test.c #include<stdio.h> main() { float f; printf("enter no"); scanf("%f",&f); printf("the floating no is%f",f); } compiled :gcc-o test test.c ./test enter no 3 $the floating no is3.0000 i don't understand what is happening?help please ________________________________________________________________________ Yahoo! India Matrimony: Find your life partner online Go to: http://yahoo.shaadi.com/india-matrimony -- GLUGOT = GNU/Linux User Group Of TCE visit: http://www.glugot.tk / (TCE students, check TCENet for GLUGOT website)