Recommendation:
Exercise 4-1. Write a program that will generate a multiplication table of a size entered
by the user. a table of size 4, for instance, would have four rows and four columns. the
rows and columns would be labeled from 1 to 4. each cell in the table will contain the
product of the corresponding row and column numbers, so the value in the position
corresponding to the third row and the fourth column would contain 12.
1 //Exercise 4.1 Generate a multiplication table */ 2 #include <stdio.h> 3 4 int main(void) 5 { 6 int table_size = 0; 7 int col = 0; // Table size */ 8 int row = 0; 9 10 printf("Enter the table size (from 2 to 12): "); 11 scanf("%d", &table_size); 12 ////////////////////////////////// 13 if(table_size > 12) 14 { 15 printf("Table size must not exceed 12 - setting to 12 "); 16 table_size = 12; 17 } 18 else if(table_size < 2) 19 { 20 printf("Table size must be at least 2 - setting to 2 "); 21 table_size = 2; 22 } 23 ///////////////////////////////////////////////////////////////// 24 for(row = 0 ; row <= table_size ; ++row) 25 { 26 printf(" "); // Start new row 27 for(col = 0 ; col<=table_size ; ++col) 28 { 29 if(row == 0) // 1st row? 30 { // Yes - output column headings 31 if(col == 0) // 1st column? 32 printf(" "); // Yes - no heading 33 else 34 printf("|%4d", col); //No - output heading 35 } 36 else 37 { // Not 1st row - output rows 38 if(col == 0) // 1st column? 39 printf("%4d", row); // Yes - output row label 40 else 41 printf("|%4d", row*col); // No - output table entry 42 } 43 } 44 if(row == 0 ) // If we just completed 1st row 45 { // output separator dashes 46 printf(" "); 47 for(col = 0 ; col <= table_size ; ++col) 48 printf("_____"); 49 } 50 } 51 printf(" "); 52 return 0; 53 54 }