C语言 scanf printf sscanf sprintf 函数

1. scanf
int a; 
scanf("%d",&a);
2. printf
int a=5;
printf("%d",a);
3. sscanf
char *str="123-12-3";
int a,b,c;
sscanf(str,"%d-%d-%d",a,b,c);
4. sprintf
char str[100];
sprintf(str,"%d",120);