c - if else statement not giving expected answer -
the values entered not matching output grade giving 10 grade when conditions 10 not met. issue on entering hardness 50 strength 5600 , carbon 0.7 giving grade 10 while grade 10 carbon should less 0.7? #include #include #include
int main() { // program grade steel on quality basis int hardness; int strength; float carbon; printf("enter hardness of steel:"); // condition 1 hardness should >= 50 scanf("%d", &hardness); printf("enter tensile strength:"); // condition 2 strength should >= 5600 scanf("%d", &strength); printf("enter carbon content:"); // condition 3 carbon less 0.7 scanf("%.2f", &carbon); if ((hardness >= 50) && (carbon < 0.7) && (strength >= 5600)) { // true printf("\ngrade = 10"); } else if ((hardness >= 50) && (carbon < 0.7) && (strength <= 5600)) { // 1 , 2 true printf("\ngrade = 9"); } else if ((hardness <= 50) && (carbon < 0.7) && (strength >= 5600)) { // 2 , 3 true printf("\ngrade = 8"); } else if ((hardness >= 50) && (carbon > 0.7) && (strength >= 5600)) { // 1 , 3 true printf("\ngrade = 7"); } else if ((hardness >= 50) && (carbon > 0.7) && (strength <= 5600)) { // 1 true printf("\ngrade = 6"); } else if ((hardness <= 50) && (carbon < 0.7) && (strength <= 5600)) { // 1 true printf("\ngrade = 6"); } else if ((hardness <= 50) && (carbon < 0.7) && (strength >= 5600)) { // 1 true printf("\ngrade = 6"); } else { printf("\ngrade = 5"); // none true } _getch(); return 0; }
use of "%.2f" format specifier not correct in scanf. printf not scanf.
it's idea check return value of scanf make sure function able read expected data.
if ( scanf("%.2f", &carbon) != 1 ) { // deal error. } add similar checks other scanf calls.
i think changing above format specifier "%f" should fix problem. add check still.
if ( scanf("%f", &carbon) != 1 ) { // deal error. } 
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